Mithrix

Mithrix
King of Nothing
Health	1000 (+300 per level)
Damage	16 (+3.2 per level)
Speed	15 m/s
Armor	20 (Plus Adaptive Armor)

Mithrix (4th Phase)
King of Nothing
Health	1400 (+420 per level)
Damage	3 (+0.6 per level)
Speed	4 m/s
Armor	20

Mithrix is the final boss of Risk of Rain 2. He is encountered at the apex of CommencementCommencement (Final)
Moon of Petrichor V
You dream of glass and dirt.

Large domain located above the shattered breach of Petrichor V's moon. It is made up of the shattered remains of four individual sections, emblematic of MithrixMithrix
King of NothingHP: 1000 (+300 per level)
Damage: 16 (+3.2 per level)
Class: Melee / Ranged
Speed: 15 m/s
Armor: 20 and Providence's tools of creation., the moon of Petrichor V and final stage of the game.

Environments

• CommencementCommencement (Final)
  Moon of Petrichor V
  You dream of glass and dirt.
  
  Large domain located above the shattered breach of Petrichor V's moon. It is made up of the shattered remains of four individual sections, emblematic of MithrixMithrix
  King of NothingHP: 1000 (+300 per level)
  Damage: 16 (+3.2 per level)
  Class: Melee / Ranged
  Speed: 15 m/s
  Armor: 20 and Providence's tools of creation.

Description

Mithrix is an ancient, cyclopian humanoid with godlike powers, much of which he shared with his brother Providence. The growing philosophical opposition between the two siblings worsened to the point that Mithrix was banished to the shattered pieces of CommencementCommencement (Final)
Moon of Petrichor V
You dream of glass and dirt.

Large domain located above the shattered breach of Petrichor V's moon. It is made up of the shattered remains of four individual sections, emblematic of MithrixMithrix
King of NothingHP: 1000 (+300 per level)
Damage: 16 (+3.2 per level)
Class: Melee / Ranged
Speed: 15 m/s
Armor: 20 and Providence's tools of creation., while Providence took to carrying out his own vision on the world below.

By the time of the events of Risk of Rain 2, Providence had been slain, yet Mithrix's confinement upon Commencement as the King of Nothing continued. It would be the Survivors of the UES Safe Travels who reached the moon via the Primordial Teleporter to put an apparent end to him.

The deeper details and circumstances of Mithrix and Providence's relationship are detailed throughout many of the game's logs, most of which are taken from Mithrix's perspective, including those for Brittle CrownBrittle Crown
Gain gold on hit... BUT surrender gold on getting hit.
30% chance on hit to gain 2 (+2 per stack) gold. Scales over time.

Lose gold on taking damage equal to 100% (+100% per stack) of the maximum health percentage you lost., A Moment, FracturedA Moment, Fractured (Hidden Realm)
Hidden Realm: A Moment, Fractured
Multiple floating islands in a void, with sharp blue crystals embedded in them. The Obelisk can be found on top of the last island., Bulwark's AmbryBulwark's Ambry (Hidden Realm)
Hidden Realm: Bulwark's Ambry
The area consists of block-shaped platforms, with the Artifact Reliquary in the center. and more.

Skills & Encounter

During phases 1 and 3 of the fight, Mithrix has the adaptive armor passive and unique scaling. These two aspects make him extremely tanky compared to other enemies due to increased health and armor boost.

Boss Encounter

Phase 1

Mithrix starts the battle with basic attacks, running towards the player to get into melee range.

Primary: Hammer Smash/Needle Barrage

This skill has two modes depending on whether Mithrix is running or not.

If Mithrix is not running, he can use Hammer Smash, where he stops and winds up to smash the ground with his hammer. A direct hit from the hammer's path deals 1200% with a proc coefficient of 1.0. As the hammer hits the ground, it creates an explosion also dealing 1200% damage with a proc coefficient of 1.0 in a radius of 12m with linear falloff. The combination of both sources of damage can kill the player though one-shot protection if the first hit doesn't trigger OSP, but if the first does trigger OSP, the blast will not damage the player as it occurs in less than 0.1s from when OSP has been triggered.

The attack lasts for 4 seconds, during which Mithrix is open to attacks. However, attack speed affects the animation of the wind up and how quickly the smash will occur from the moment the skill is activated.

This skill has a cooldown of 4 seconds.

If Mithrix is sprinting instead, he can fire up to 12 homing needles moving at 120m/s that last 3 seconds. Each needle explodes upon impact or when despawning dealing 60% damage with a proc coefficient of 1.0 in a radius of 2m with no falloff.

This skill has a cooldown of 6 seconds, which begins after the first needle is fired. Once the skill has come off cooldown, it will replenish all 12 stocks regardless of how many have been used.

If Mithrix toggles sprinting while the skill is on cooldown so that it switches to Hammer Smash and back, all charges will be replenished immediately.

Secondary: Hammer Swing

Mithrix swipes with his hammer, dealing 200% damage with a proc coefficient of 1.0 while pushing the target away. This attack moves him forwards a moderate amount.

This skill has a cooldown of 5 seconds and the attack animation lasts for 4 seconds which scales with attack speed.

Utility: Dash

Mithrix dashes a short distance forward, backward, left, or right for 0.3 seconds. This also removes all his timed debuffs, but not any damage-over-time effects.

This skill has a cooldown of 3 seconds and holds 2 charges.

Special: Shock Wave

Mithrix bends down to jump high into the air, which he does after 1 second (scales with attack speed). After 3 seconds he slams down in the center of the arena, creating a ring-shaped shockwave consisting of 12 waves that travel outwards at 60m/s for 3 seconds. The shock wave effectively ends when it reaches the thin line of rocks between the platform where he is first seen. Each wave deals 400% with a proc coefficient of 1.0 and inflicts CrippleCripple (Debuff)
Reduces armor by 20. Reduces movement speed by 50%..

These waves can be blocked by Captain's Defensive MicrobotsDefensive Microbots (Passive)Passively gain Microbots that shoot down nearby enemy projectiles. Drones are also given Microbots.
Survivor: Captain.

Mithrix gains Armor BoostArmor Boost (Buff)
Gain additional armor.Gain +200 armor. while jumping and landing, and Hidden InvincibilityHidden Invincibility (Buff)
Become invulnerable.Become immune to all attacks. while in the air. If Mithrix is frozen by Artificer'sArtificerThe Artificer is a high burst damage survivor who excels in fighting large groups and bosses alike.
Class: Ranged
HP: 110 (+33 per level)
Damage: 12 (+2.4 per level)
Armor: 0
Umbra: Herald of the House Beyond or Survivors of the Void - DLC Content
Railgunner is part of the Survivors of the Void DLC. It is only available if the DLC is enabled when starting a run.
Click for more info. Railgunner'sSurvivors of the Void - DLC Content
This content is part of the Survivors of the Void DLC. It is only available if the DLC is enabled when starting a run.
Click for more info.RailgunnerThe Railgunner is a long-range, single target survivor that can instantly kill any high priority target - and from any range.
Class: Ranged
HP: 110 (+33 per level)
Damage: 12 (+2.4 per level)
Armor: 0
Umbra: Forgotten Nomad skills while preparing to jump, the jump will be cancelled.

This skill has a cooldown of 30 seconds.

Behaviors

1. Use special (Shock Wave): Mithrix must have less than 75% health.
2. Use utility and strafe: Mithrix must be within 40m from its target, This behavior cannot be selected twice in a row. If this behavior is selected as Mithrix is approaching the player, it will very likely be followed up by either his primary or secondary skill. This can look like strafing out of the way of a possible incoming attack and then attacking from the flank.
3. Use utility: Mithrix must be within 40-50m from its target. This behavior cannot be selected twice in a row.
4. Use secondary: Mithrix must be within 40m from its target.
5. Use primary (Hammer Smash): Mithrix must be within 35m from its target.
6. Sprint and use primary (Needle Barrage): Mithrix must be more than 70m away from its target, have line of sight, and have less than 80% health. Mithrix will ignore the node graph and run directly towards the target. This behavior is active for 2 seconds.
7. Chase off nodegraph: Mithix must be within 50m from its target and have line of sight. This behavior is active for 2 seconds and will most likely be selected when Mithrix is near the target after both the primary and secondary are on cooldown.
8. Sprint off nodegraph: Mithrix must be more than 50m away from its target. This behavior is active for 1 second.
9. Chase: no requirements.

Phase 2

Mithrix leaves the arena, and several stone pillars rise up around the arena. In place of Mithrix himself, 2 Lunar Chimera GolemsLunar Chimera (Golem)
Zenith DesignsHP: 1615 (+485 per level)
Damage: 35 (+7 per level)
Class: Ranged
Speed: 8 m/s
Armor: 0 and 4 Lunar Chimera WispsLunar Chimera (Wisp)
Zenith DesignsHP: 850 (+255 per level)
Damage: 15 (+3 per level)
Class: Ranged
Speed: 18 m/s
Armor: 0 initially spawn around the arena with more Lunar Chimera (Exploder)
Zenith DesignsHP: 180 (+54 per level)
Damage: 11 (+2.2 per level)
Class: Ranged / Self-Destruct
Speed: 8 m/s
Armor: 0 Lunar Chimera (Golem)
Zenith DesignsHP: 1615 (+485 per level)
Damage: 35 (+7 per level)
Class: Ranged
Speed: 8 m/s
Armor: 0 Lunar Chimera (Wisp)
Zenith DesignsHP: 850 (+255 per level)
Damage: 15 (+3 per level)
Class: Ranged
Speed: 18 m/s
Armor: 0 Lunar enemies spawning by a Combat Director as time goes on. All spawned enemies must be defeated to complete this phase.

Phase 3

Mithrix returns with his hammer glowing blue and some of his attacks are now upgraded. Lunar enemies will also continue spawning occasionally.

Primary: Lunar Hammer Smash/Needle Barrage

Mithrix's Hammer Smash is now energized and upon explosion it will create two additional effects. 3 small shock waves are sent forward, similar to those from his Shock Wave skill. These deal 200% with a proc coefficient of 1.0 and also inflict Cripple.

A lingering pillar of blue flame is also created at the hammer's point of impact, which deals 75% damage with a proc coefficient of 0.2 and ticks 6 times per second for 45 seconds. These pillars are 40m tall and can go through terrain. This means that if the player is on top of a ramp on the outer areas of the arena and Mithrix smashes the ground underneath, the pillar can go through the ramp's ceiling and damage the player. These pillars can also be blocked by Defensive Microbots.

Special: Shock Wave/Big Spinny

After Mithrix performs his Shock Wave leap, his special skill is replaced by a new one which becomes available after a cooldown of 8 seconds. Once this new skill has been activated, it will revert back to Shock Wave.

With this new skill Mithrix creates 9 pillars that rotate either clockwise or anticlockwise. After 2 seconds they deal damage on the spot for 900% damage with a proc coefficient of 1.0 and also inflict Cripple. Mithrix will execute this attack 5 times in a row, with each time the rotation being random.

These pillars can be individually blocked by Defensive MicrobotsDefensive Microbots (Passive)Passively gain Microbots that shoot down nearby enemy projectiles. Drones are also given Microbots.
Survivor: Captain, but the player must be within 20m of the center of rotation which makes it very hard to avoid the attacks. With high enough attack speed, it is possible to block them all before they go off.

Behaviors

Mithrix behaves the same away as in Phase 1, but he has one new behavior that supersedes every other in terms of priority for his new special attack.

1. Use special (Big Spinny): Mithrix must have less than 80% health. In theory this will always be selected when the skill comes off cooldown after Shock Wave, since the latter requires less than 75% health to be used. However, if Mithrix has healing items from the Artifact of Evolution, it is possible to use Shock Wave after having less than 75% health, but then recover to more than 80% before Big Spinny comes off cooldown.

Phase 4

Mithrix appears at the center of the arena and looks weakened with his armor broken and his hammer gone. He starts by stealing all players' and their allies' items, during which time he is invulnerable. Damaging him will release the items. See the Notes section for more details of how this works.

The stealing of the player's items can be skipped if Mithrix takes damage in the first frame of the phase. This is due to his invulnerability being applied after a short window, and not being present on spawn. This is most easily done with continuous damage, most notably a Kjaro's BandKjaro's Band
High damage hits also blasts enemies with a runic flame tornado. Recharges over time.
Hits that deal more than 400% damage also blasts enemies with a runic flame tornado, dealing 300% (+300% per stack) TOTAL damage over time. Recharges every 10 seconds. triggered in the center of the arena (which may occur when Mithrix's phase 3 is finished after his jump slam). This will leave Mithrix with no items, and the player with all of their items, resulting in a quick completion of this phase.

Mithrix moves much slower than in the previous phases, slowly stomping around the arena and using exclusively ranged attacks. While his base damage is also weaker, the use of the stolen items can cause devastation. His HP is governed by a different formula and since he no longer has unique scaling, his max HP will be significantly lower. Any single instance of damage that deals more than 30% of his health will also stagger him. If the player has any Halcyon Seeds, AurelioniteAurelionite
Titanic GoldweaverHP: 2100 (+630 per level)
Damage: 40 (+8 per level)
Class: Melee / Ranged
Speed: 5 m/s
Armor: 20 will spawn and help the player during this phase.

There is a bug in which Mithrix will give the player Tonic Afflictions without either of them previously having any.

Primary: Needle Burst

Similar to his needle attack from the previous phases, but there is less spread.

Secondary: Lunar Orbs

Mithrix kneels and pounds the ground, creating a blast that deals 600% damage with a proc coefficient of 1.0 in a radius of 12m with linear falloff. This also creates a ring of 8 orbs that spiral outwards, converge back into the center and then spiral out again. Upon impact they deal 400% damage with a proc coefficient of 1.0 in a radius of 6m with linear falloff. Their lifetime is 9s (plus a random 0.0-0.3 second offset), after which they will explode on the spot, so players should avoid being near them at that point.

Mithrix also deals 8% of his current health as non-lethal damage to himself.

This skill has an animation duration of 6 seconds which scales with attack speed.

This skill has a cooldown of 8 seconds, which does not start until the attack has finished.

Behaviors

1. Use secondary: Mithrix must be within 180m from its target and have less than 90% health.
2. Use primary: no requirements as long as the skill is off cooldown.
3. Chase: no requirements.

Aftermath

Once Mithrix is defeated, all stolen items are returned and the moon begins a detonation sequence with an on-screen countdown. In order to exit Mithrix's arena, the surviving players must jump into one of the floating portals in order to teleport out. The players have 3 minutes to get to the Rescue Ship and complete its holdout event in order to escape, which requires the players to protect the ship by staying near it for 1 minute. Lines of flames will appear all across the map, similar to the columns used by some of Mithrix's attacks. Void ReaversVoid Reaver
HP: 1900 (+570 per level)
Damage: 12 (+2.4 per level)
Class: Ranged / Self-Destruct
Speed: 6 m/s
Armor: 0 and Lunar Chimera (Wisp)
Zenith DesignsHP: 850 (+255 per level)
Damage: 15 (+3 per level)
Class: Ranged
Speed: 18 m/s
Armor: 0 Lunar Chimera (Exploder)
Zenith DesignsHP: 180 (+54 per level)
Damage: 11 (+2.2 per level)
Class: Ranged / Self-Destruct
Speed: 8 m/s
Armor: 0 ChimerasLunar Chimera (Golem)
Zenith DesignsHP: 1615 (+485 per level)
Damage: 35 (+7 per level)
Class: Ranged
Speed: 8 m/s
Armor: 0 will spawn and attack the player, but they generally won't enter the protection zone of the Rescue Ship.

Successfully making it to the shuttle will complete the Washed Away challenge and unlock the CaptainCaptainThe Captain is a unique survivor that can control the battlefield with utility and damage - with help from the UES Safe Travels.
Class: Ranged
HP: 110 (+33 per level)
Damage: 12 (+2.4 per level)
Armor: 0
Umbra: Tired Veteran as a playable Survivor. Additionally, on Monsoon difficulty, it will complete the The Calm challenge and unlock PurityPurity
Reduce your skill cooldowns by 2 seconds. You are unlucky.
All skill cooldowns are reduced by 2 (+1 per stack) seconds. All random effects are rolled +1 (+1 per stack) times for an unfavorable outcome., and unlocks the mastery skin for each player's current Survivor.

Arena Escape Portals

5 out of the 12 escape portals will randomly spawn, each with their own predefined teleport destination. They all rotate either clockwise or anticlockwise around the center of the arena at fixed radii lengths and heights. To identify them correctly, look for a big giant rock floating outside the arena and turn 180°. With your back against the reference point, the image below shows all the portals at the initial position they spawn and the direction they travel.

The teleport location and distance from the dropship for each escape portal is:

1. On the bridge between the two Pillars of Design islands, 883.3 m away.
2. In the middle of the Pillars of Blood area, 994.4 m away.
3. On the far top floor of the Pillars of Soul area, 567.3 m away.
4. On the back right of the Pillars of Blood area, 1022.9 m away.
5. On the Cauldron island, 863.4 m away.
6. On the Cauldron island near the chains towards the Pillars of Mass, 763.8 m away.
7. On the ground floor or the Pillars of Soul area, 472.7 m away.
8. On the Pillars of Design area, close to the center pillar leading to Mithrix, 736.3 m away.
9. On the Pillars of Design area without the cauldrons, 874.2 m away.
10. On the Pillars of Design area, very close to the center pillar leading to Mithrix, 721.1 m away.
11. On the back left of the Pillars of Blood area, 1109.2 m away.
12. On the far back of the Pillars of Blood area, 1058.8 m away.

Notes

• Mithrix steals items in two phases. In the first phase he steals an item from every player and their minions every 0.2 seconds for 9 seconds. In the second phase he steals an item every 0.1 second until all have been stolen. Due to frame rounding, in phase 1 he ends up stealing every 0.21666 seconds. Since the first item takes 1 second to reach Mithrix, he effectively registers 37 items from each entity at the end of phase 1.
  • While Mithrix steals items from minions, there is no visual effect of the item transfer.
• Mithrix will only use items stolen during the first phase, excluding all items from minions and any items in the AIBlacklist and BrotherBlacklist categories. As items are returned, it will be those from phase 1 first, even if Mithrix is not using them himself.
  • This means that if a player has 50 items, Mithrix will use any allowed items in 14-50. The items will be returned in the order 14-50, 1-13.
  • While in single player Mithrix can use up to 37 items, in multiplayer this is very likely to be higher unless each player's last 37 items are the same.
• Mithrix cannot steal items from the CannotSteal category. This also includes untiered items that are used for game mechanics, including AdaptiveArmor, BoostAttackSpeed, BoostDamage, BoostEquipmentRecharge, BoostHp, ConvertCritChanceToCritDamage, CutHp, DrizzlePlayerHelper, DroneWeaponsBoost, DroneWeaponsDisplay1, DroneWeaponsDisplay2, ExtraLifeConsumed, ExtraLifeVoidConsumed, FragileDamageBonusConsumed, Ghost, GummyCloneIdentifier, HealingPotionConsumed, HealthDecay, InvadingDoppelganger, MageAttunement, MinHealthPercentage, MinionLeash, MonsoonPlayerHelper, SkullCounter, TeamSizeDamageBonus, TeleportWhenOob, TonicAffliction, UseAmbientLevel, VoidmanPassiveItem.
• While Mithrix steals all items from players and minions, the accumulated damage threshold for returning an item is only the sum of items stolen during the first phase and only from players.
  • For example, for two players this will be up to 1/74 of his max health per item. Note that this percentage is capped at 1/100.
  • The items are returned one by one in the order they were obtained. In multiplayer, the items will be returned to players in round robin order, by player slot.
  • The accumulated damage received is not decreased when Mithrix recovers health either from healing or shield recharging.
• Upon fully charging the Rescue Ship and beating the game, all players (dead or alive) will be awarded 10 lunar coins.

Tips

• While players cannot issue attacking commands during Mithrix's spawning introduction, it is possible to damage him with attacks that can be triggered automatically.
  • Gesture of the DrownedGesture of the Drowned
    Dramatically reduce Equipment cooldown... BUT it automatically activates.
    Reduce Equipment cooldown by 50% (+15% per stack). Forces your Equipment to activate whenever it is off cooldown. with a number of damaging equipment, e.g. Royal Capacitor20sRoyal Capacitor
    Call down a lightning strike on a targeted monster.
    Call down a lightning strike on a targeted monster, dealing 3000% damage and stunning nearby monsters..
  • Activating The CrowdfunderThe Crowdfunder
    Toggle to fire. Costs gold per bullet.
    Fires a continuous barrage that deals 100% damage per bullet. Costs $1 per bullet. Cost increases over time. and aiming where Mithrix spawns.
  • Engineer'sEngineerThe Engineer is a unique class that requires planning and positioning to be successful.
    Class: Ranged
    HP: 130 (+39 per level)
    Damage: 14 (+2.8 per level)
    Armor: 0
    Umbra: Fortification Expert turrets. His mines can also be triggered if placed close enough to the center.
  • Entering Huntress'sHuntressThe Huntress is an extremely mobile but fragile survivor with a high damage output.
    Class: Ranged
    HP: 90 (+27 per level)
    Damage: 12 (+2.4 per level)
    Armor: 0
    Umbra: Judge, Jury, Executioner BallistaBallista (Special)Teleport backwards into the sky. Fire up to 3 energy bolts, dealing 3x900% damage.
    Survivor: Huntress targetting mode before Mithrix spawns ensures they will auto-fire after the blue shield has disappeared.
  • Having Resonance DiscResonance Disc
    Obtain a Resonance Disc charged by killing enemies. Fires automatically when fully charged.
    Killing 4 enemies in 7 seconds charges the Resonance Disc. The disc launches itself toward a target for 300% base damage (+300% per stack), piercing all enemies it doesn't kill, and then explodes for 1000% base damage (+1000% per stack). Returns to the user, striking all enemies along the way for 300% base damage (+300% per stack). fully charged before entering the arena ensures it will fire at Mithrix as soon as he becomes a viable target.
  • Captain'sCaptainThe Captain is a unique survivor that can control the battlefield with utility and damage - with help from the UES Safe Travels.
    Class: Ranged
    HP: 110 (+33 per level)
    Damage: 12 (+2.4 per level)
    Armor: 0
    Umbra: Tired Veteran OGM-72 'DIABLO' StrikeOGM-72 'DIABLO' Strike (Utility)Stunning. Request a kinetic strike from the UES Safe Travels. After 20 seconds, it deals 40,000% damage to ALL characters.
    Survivor: Captain can be used to effectively and reliably one-shot, or at the very least, severely damage Mithrix. However, this requires exact timing, and the player should ideally have high stacks of CrowbarsCrowbar
    Deal bonus damage to enemies above 90% health.
    Deal +75% (+75% per stack) damage to enemies above 90% health., Runald's BandsRunald's Band
    High damage hits also blasts enemies with runic ice. Recharges over time.
    Hits that deal more than 400% damage also blasts enemies with a runic ice blast, slowing them by 80% for 3s (+3s per stack) and dealing 250% (+250% per stack) TOTAL damage. Recharges every 10 seconds., and/or Shaped GlassShaped Glass
    Double your damage... BUT halve your health.
    Increase base damage by 100% (+100% per stack). Reduce maximum health by 50% (+50% per stack).. When first entering the arena, place the DIABLO Strike in the center of the arena. When the cooldown timer reaches 29 seconds, run to the center of the arena and initiate the fight. During Phase 2, leave 1 enemy alive (avoid any offensive drones or minion items for this to work), then place a DIABLO Strike in the center of the arena. Wait until the cooldown timer reaches 28 seconds and kill the last enemy. If the player has Kjaro's BandKjaro's Band
    High damage hits also blasts enemies with a runic flame tornado. Recharges over time.
    Hits that deal more than 400% damage also blasts enemies with a runic flame tornado, dealing 300% (+300% per stack) TOTAL damage over time. Recharges every 10 seconds., it will also instantly kill Mithrix when he begins Phase 4.
• Mithrix cannot climb the pillars that appear on Phase 2, so if the player gets on top of them and uses ranged attacks, Phase 3 and 4 will be very easy. The ranged attack on Phases 3 and 4 can be easily dodged from higher ground as well. HOWEVER, the lines of flame in Phase 3 can still hit the player.
• Artificer'sArtificerThe Artificer is a high burst damage survivor who excels in fighting large groups and bosses alike.
  Class: Ranged
  HP: 110 (+33 per level)
  Damage: 12 (+2.4 per level)
  Armor: 0
  Umbra: Herald of the House Beyond SnapfreezeSnapfreeze (Utility)Freezing. Create a barrier that hurts enemies for 100% damage.
  Survivor: Artificer and Cast Nano-SpearCast Nano-Spear (Secondary)Freezing. Charge up a piercing nano-spear that deals 400%-1200% damage.
  Survivor: Artificer skills are capable of freezing and executing Mithrix, unlike other bosses.
  • The player can use Ion SurgeIon Surge (Special)Stunning. Burst into the sky, dealing 800% damage.
    Survivor: Artificer to avoid the entirety of Mithrix's first phase.
• On-kill items, such as Topaz BroochTopaz Brooch
  Gain a temporary barrier on kill.
  Gain a temporary barrier on kill for 15 health (+15 per stack). and Will-o'-the-wispWill-o'-the-wisp
  Detonate enemies on kill.
  On killing an enemy, spawn a lava pillar in a 12m (+2.4m per stack) radius for 350% (+280% per stack) base damage., are almost useless for Mithrix, as they will not activate unless he kills a player or ally.
• Mithrix will use Survivors of the Void - DLC Content
  Lost Seer's Lenses is part of the Survivors of the Void DLC. It is only available if the DLC is enabled when starting a run.
  Click for more info. Lost Seer's LensesSurvivors of the Void - DLC Content
  This content is part of the Survivors of the Void DLC. It is only available if the DLC is enabled when starting a run.
  Click for more info.Lost Seer's Lenses
  Gain a 0.5% chance to instantly kill a non-boss enemy. Corrupts all Lens-Maker's Glasses.
  Your attacks have a 0.5% (+0.5% per stack) chance to instantly kill a non-Boss enemy. Corrupts all Lens-Maker's Glasses. during Phase 4, but they have no effect against players.
  • He can still kill drones and AurelioniteAurelionite
    Titanic GoldweaverHP: 2100 (+630 per level)
    Damage: 40 (+8 per level)
    Class: Melee / Ranged
    Speed: 5 m/s
    Armor: 20 with them.
• If Mithrix takes a PurityPurity
  Reduce your skill cooldowns by 2 seconds. You are unlucky.
  All skill cooldowns are reduced by 2 (+1 per stack) seconds. All random effects are rolled +1 (+1 per stack) times for an unfavorable outcome. in Phase 4, he will almost constantly fire projectiles.
• Mithrix will take and use any Repulsion Armor PlateRepulsion Armor Plate
  Receive flat damage reduction from all attacks.
  Reduce all incoming damage by 5 (+5 per stack). Cannot be reduced below 1.s during Phase 4, making the fight significantly harder for survivors who rely on dealing a rapid amount of low damage hits, like CommandoCommandoThe Commando is a jack-of-all-trades character that is reliable in all situations of the game.
  Class: Ranged
  HP: 110 (+33 per level)
  Damage: 12 (+2.4 per level)
  Armor: 0
  Umbra: Cornered Gunslinger or MUL-TMUL-TMUL-T is an aggressive survivor who has the tools necessary for any job!
  Class: Melee / Ranged
  HP: 200 (+60 per level)
  Damage: 11 (+2.2 per level)
  Armor: 12
  Umbra: Right Tool for the Wrong Job.
  • This is particularly troublesome for CaptainCaptainThe Captain is a unique survivor that can control the battlefield with utility and damage - with help from the UES Safe Travels.
    Class: Ranged
    HP: 110 (+33 per level)
    Damage: 12 (+2.4 per level)
    Armor: 0
    Umbra: Tired Veteran, as Defensive MicrobotsDefensive Microbots
    Shoot down nearby projectiles. Recharge rate scales with attack speed.
    Shoot down 1 (+1 per stack) projectiles within 20m every 0.5 seconds. Recharge rate scales with attack speed. will stop both of his utility and special skills, forcing him to rely on his equipment and primary.
• Mithrix will take Dio's Best FriendDio's Best Friend
  Cheat death. Consumed on use.
  Upon death, this item will be consumed and you will return to life with 3 seconds of invulnerability. during Phase 4, and he will use it if given the chance. However, players will regain an unspent Dio's Best Friend along with all other stolen items upon Mithrix's first death. If Dio's Best Friend is recovered before Mithrix dies, he won't gain a second life.
• When the Artifact of Swarms is enabled, two Mithrices will spawn. Players must kill both bosses before they will advance from one phase to the next. However, when one's health is emptied, it will be incapacitated until the next phase.
  • This is especially dangerous if both Mithrices use their fire wheel attack at once, making it exceedingly difficult to dodge.
  • As with other enemies, if the one Mithrix hits the other while Artifact of Chaos is active, they will begin to attack each other. This is highly likely to happen during his stomp attack, and makes the fight significantly easier.
• During Phase 4, the Solus ProbesSolus Probe
  HP: 220 (+66 per level)
  Damage: 15 (+3 per level)
  Class: Ranged
  Speed: 10 m/s
  Armor: 10 spawned from Empathy CoresEmpathy Cores
  Recruit a pair of Solus Probes that gain power with more allies.
  Every 30 seconds, summon two Solus Probes that gain +100% (+100% per stack) damage per ally on your team. remain with the player and deal significant damage to Mithrix, making the phase noticeably easier.
  • Be wary that when Mithrix steals the Empathy Cores, he gains his own Probes which are allied with him that will attack the player.
  • The same thing happens when Mithrix steals the Queen's GlandQueen's Gland
    Recruit a Beetle Guard.
    Every 30 seconds, summon a Beetle Guard with bonus 300% damage and 100% health. Can have up to 1 (+1 per stack) Guards at a time., which is especially dangerous since the Beetle GuardBeetle Guard
    HP: 480 (+144 per level)
    Damage: 12 (+2.4 per level)
    Class: Melee / Ranged
    Speed: 17 m/s
    Armor: 0 ally he will gain is much stronger than a normal Beetle Guard.
• Using Goobo Jr. at Phase 4 deals huge damage to Mithrix, while player stay in safe space, without any drawbacks.
• The Happiest MaskHappiest Mask
  Chance on killing an enemy to summon a ghost.
  Killing enemies has a 7% chance to spawn a ghost of the killed enemy with 1500% damage. Lasts 30s (+30s per stack). can create a ghost of Mithrix.

Dialogue

Mithrix and Seekers of the Storm - DLC Content
False Son (Boss) is part of the Seekers of the Storm DLC. It is only available if the DLC is enabled when starting a run.
Click for more info. False Son (Boss)Seekers of the Storm - DLC Content
This content is part of the Seekers of the Storm DLC. It is only available if the DLC is enabled when starting a run.
Click for more info.False Son (Boss)
HP: 1200 (+360 per level)
Damage: 17 (+3.4 per level)
Class: Melee
Speed: 11 m/s
Armor: 23 are unique in that both bosses speak throughout the fight, with quotes appearing in the chat box. His dialogue may change depending on what items the player holds or which character they are playing as.

Toggle Dialogue

Spawning

• Pray.
• Beg.
• Die.
• Be slaughtered.

Spawning (when the Player is the HereticHereticThe Heretic is a powerful character who can only be accessed through extraordinary means.
Class: Ranged
HP: 440 (+132 per level)
Damage: 18 (+3.6 per level)
Armor: 0
Umbra: Unorthodoxy Risen)

• Regret this journey, Heretic.
• Die again, Heretic.

Dealing damage (early phases)

• Bleed.
• Now is the time for fear.
• Weak.
• Frail - and soft.
• You are nothing.
• Mistake.
• Scream, vermin.
• Break beneath me.
• Slow.
• Your body will shatter.

Dealing damage (final phase)

• BLEED.
• SCREAM.
• WHERE'S YOUR INFLUENCE?
• FLEETING STRENGTH.
• FRAIL.
• BREAK.
• FALSE STRENGTH.
• DRAIN.
• DIE, VERMIN.
• WEAK, WITHOUT YOUR BAUBLES AND TRINKETS.

Player is killed (early phases)

• Return to dirt.
• Submit, vermin.
• Die, vermin.
• Die, weakling.
• Become memories.

Player is killed (final phase)

• DIE.
• WEAK.
• USELESS.
• AS I THOUGHT...
• VERMIN.

Player is killed as Heretic (early phases)

• Return to pieces, Heretic.
• Die again, Heretic.

Player is killed as Heretic (final phase)

• RETURN TO PIECES, HERETIC.
• DIE AGAIN, HERETIC.

The Player has Halcyon SeedHalcyon Seed
Summon Aurelionite during the Teleporter event.
Summon Aurelionite during the teleporter event. It has 100% (+50% per stack) damage and 100% (+100% per stack) health. (final phase)

• THE GUARDIAN...? IMPOSSIBLE...!
• THE WRETCHED GUARDIAN!

The Player has Halcyon Seed and Aurelionite is killed

• YOU CANNOT DEFY ME, GUARDIAN.
• RETURN TO DIRT, GUARDIAN.

The Player has Halcyon Seed and is also the Heretic (final phase)

• THE HERETIC? THE GUARDIAN? HOW? WHO PULLS YOUR STRINGS, VERMIN?

Mithrix kills a drone

• Inferior construct. Broken.
• Primitive scrap.
• Disassembled.

Mithrix is killed

• NO... NOT NOW...
• WHY... WHY NOW...?
• NO... NO...!
• BROTHER... HELP ME...!
• THIS PLANE GROWS DARK... BROTHER... I CANNOT SEE YOU... WHERE ARE YOU...?
• BROTHER... PERHAPS... WE WILL GET IT RIGHT... NEXT TIME...

Lore

They knew to stay away from the wells - but they were just kids. And they just wanted to know.

They threw in dirt and stone and kifruit and starseed, watching as they collapsed. Thorp! The gravity wells would swallow up anything. Glass and mud and silver. Wind. Heat. Pulsar radiation.

And when his brother wasn’t watching, Mithrix would throw in worms. Thorp! But only when he wasn’t watching. You see, his brother loved worms. It would make him sad. But Mithrix didn’t care much about worms. He was just curious.

But one time, his brother was watching. And his brother loved worms.

Trivia

• There is an unused introduction to the fight where Mithrix spawns sitting on a throne instead of dropping in from the sky.
• The Hammer Smash is conditionally set to be the primary skill if Mithrix is not sprinting or is grounded. This means that if Mithrix sprints, so that the skill switches to Needle Barrage, but then jumps, the skill will switch back to Hammer Smash upon landing even if Mithrix is still sprinting.
• In the code there is an unused idea when Mithrix uses his Shock Wave on Phase 3, where he spawns an undetermined number of glass-looking copies of himself that last for 20 seconds, have much lower stats and can only use the secondary skill. As it currently stands, 0 such copies spawn.
• Shock Wave actually holds 5 charges and requires all 5 to activate the skill. After coming off cooldown all 5 charges will be replenished. Mithrix would need 5 Survivors of the Void - DLC Content
  Lysate Cell is part of the Survivors of the Void DLC. It is only available if the DLC is enabled when starting a run.
  Click for more info. Lysate CellsSurvivors of the Void - DLC Content
  This content is part of the Survivors of the Void DLC. It is only available if the DLC is enabled when starting a run.
  Click for more info.Lysate Cell
  Add an extra charge of your Special skill. Corrupts all Fuel Cells.
  Add +1 (+1 per stack) charge of your Special skill. Reduces Special skill cooldown by 33%. Corrupts all Fuel Cells. in order to be able to use the skill twice in a row. But the cooldown would still replenish only 5 charges at a time.
  • On Phase 3 after activating the skill once, it would switch to Big Spinny and each Lysate Cell would grant an extra charge. However, upon using this once, it would revert back to Shock Wave regardless of how many charges it had remaining.
• While Hammer Smash and Hammer Swing have long end lag delays, it is possible to use the Dash to cancel them and regain control much faster. If Mithrix is in close range and has at least 1 Dash charge, he can use both skills in quick succession.
• Mithrix’s theme is "You're Gonna Need a Bigger Ukulele."
• Mithrix on Phase 4 still retains his Dash and Shock Wave skills, but he is not programmed to use them.
• The Big Spinny flame walls extend outwards for 300m. The arena is big enough that if Mithrix is executing the attack near the edges, the walls will not reach the opposite side.
• The blue flame wall attacks that occur during the aftermath of the fight are actually executed by a hidden character called "BrotherHaunt". Brother is the internal name for Mithrix.
• Any one of Mithrix’s three encounters have the chance to drop his Logbook.
• Mithrix attacks are similar to those of his brother in the original Risk of Rain.
  • Both have an attack where they swing their weapon forward.
  • Mithrix Shock Wave Leap is similar to to Providence's Leap Sword Strike and his Shockwave attacks.
  • Mithrix thrusts his hammer onto the ground for his Rotating Fire Walls attack in a similar way to Providence and his Shockwave attack.
  • Mithrix's Lunar Chimera (Golem) is similar to the Sanctuary Guards that Providence summons.
  • In Risk of Rain Returns, Providence gets new moves which are also similar to his brother's.
    • He thrusts his sword on the ground, spawning 9 lasers of energy, similarly to Mithrix' 9 Flame Walls attack.
    • He summons orbs similar to Mithrix', though these fly instead of moving on the ground, and their behavior is different.
    • He will occasionally dash in his last phase, like Mithrix does.
    • He can erupt lasers similarly to how Mithrix can spawn fire pillars.
• The line "BROTHER... PERHAPS... WE WILL GET IT RIGHT... NEXT TIME..." may mean that Mithrix and Providence's species is capable of resurrection or regeneration.
• When Mithrix steals the player's items on phase 4, he will gain spikes on parts of his body colored by the type of item he steals, for example uncommon items would give him green spikes:

Expand example image of the spikes

Version History

Survivors of the Void

• (Undocumented) Health: 1400 (+420 per level) ⇒ 1000 (+300 per level)

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PS4 & Xbox One Patch

• Bug Fixes
  • Solved an issue where the game would freeze during the last Mithrix phase as the HereticHereticThe Heretic is a powerful character who can only be accessed through extraordinary means.
    Class: Ranged
    HP: 440 (+132 per level)
    Damage: 18 (+3.6 per level)
    Armor: 0
    Umbra: Unorthodoxy Risen.

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PC Patch v1.1.1.2

• Bug Fixes
  • Fixed a crash during the last boss fight

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Anniversary Update

• Gameplay Changes
  • Base Health: 1000 (+300 per level) ⇒ 1400 (+420 per level)
  • Added stagger state triggered by taking high damage
  • Item Steal
    • Now consistently returns items as you deal damage, rather than randomly, i.e if you have him at 50% health, you will have 50% of your items back
    • Now consistently returns items to players in multiplayer in order (1, 2, 3, 4, 1, 2, 3, 4) rather than per-player damage
    • Now returns items in the order that you found them, rather than in reverse order
    • Now utilizes CrowbarsCrowbar
      Deal bonus damage to enemies above 90% health.
      Deal +75% (+75% per stack) damage to enemies above 90% health.
• Bug Fixes
  • Fixed the final boss’s crystals not being correctly colored

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PC Patch v1.0.2.0

• Bug Fixes
  • Fixed the final boss’ shockwaves being fired an extra time for each remote client in the game

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PC Patch v1.0.1.1 (Build ID No.5440050)

• Gameplay Changes
  • Developer Notes: The goal with these changes is to make the final phase of the fight more consistent, fix a few softlock scenarios, and to remove a few cheeses. The expectation is that with these changes, the final phase (and only the final phase) will be much easier. We want this to be a fun phase, not a frustrating conclusion
  • Remove “unique” scaling on health and damage. This has a significant reduction on the way his health and damage scales over time, especially later into the run. Expect him to have less than half of the current live build, depending on time.
  • Lunar Shard Attack
    • Projectile Cone: 20° ⇒ 0.5°
    • Developer Notes: The intent for this change is to reduce the cone that the attacks come out of, reducing the chance you randomly get hit by a stray shot.
  • Energy Ball Attack
    • Damage Coefficient: 1000% ⇒ 700%
    • Knockback Force: 400 ⇒ 4000%
    • Projectile Radius: 3m ⇒ 2m
    • Now glows with a stronger effect to make it more visually noticeable, especially when swinging around corners
  • Item Steal
    • Add immunity while channeling.
    • Can no longer use Mired UrnMired Urn
      Siphon health from nearby enemies while in combat.
      While in combat, the nearest 1 (+1 per stack) enemies to you within 13m will be 'tethered' to you, dealing 100% damage per second, applying tar, and healing you for 100% of the damage dealt. and CrowbarsCrowbar
      Deal bonus damage to enemies above 90% health.
      Deal +75% (+75% per stack) damage to enemies above 90% health.. He will take them, but will be unable to use them. This is a mechanic we already have in place for a few key items ( RazorwireRazorwire
      Retaliate in a burst of razors on taking damage.
      Getting hit causes you to explode in a burst of razors, dealing 160% damage. Hits up to 5 (+2 per stack) targets in a 25m (+10m per stack) radius, Tougher TimesTougher Times
      Chance to block incoming damage.
      15% (+15% per stack) chance to block incoming damage. Unaffected by luck.) that can cause softlocks or impossible scenarios.
    • Now steals items from minions, like Engineer Turrets. He won’t use the items he takes from minions.
    • Minions can now retrieve items for their owner.
  • Add visual effect to Tesla CoilUnstable Tesla Coil
    Shock all nearby enemies every 10 seconds.
    Fire out lightning that hits 3 (+2 per stack) enemies for 200% base damage every 0.5s. The Tesla Coil switches off every 10 seconds. being active
• Bug Fixes
  • Fix Final Boss health bar not showing for clients (including phase 2)
  • Fix final boss fight sometimes not triggering

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Early Access Content Update 5

• Major Content
  • Added New Final Boss: ???
  • Added New Monster Lore Entry: ???