Risk of Rain 2 Wiki
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Mithrix
Mithrix - Logbook Model.jpg
King of Nothing
Health 1400 (+420 per level)
Damage 16 (+3.2 per level)
Speed 15 m/s
Armor 20 (Plus Adaptive Armor)

Mithrix is the final boss of Risk of Rain 2. He is encountered at the apex of Commencement.png Commencement, the moon of Petrichor V and final stage of the game.

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 Commencement, 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 Crown.png Brittle CrownBgLunar.pngBrittle Crown.pngGain gold on hit... BUT lose 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, Fractured, Bulwark's Ambry and more.

Skills & Encounter

Adaptive Armor

During phases 1 and 3 of the fight, Mithrix has the Adaptive Armor passive which protects him against bursts of damage. Every time Mithrix takes damage, he gains temporary armor equal to , or 30 armor per 1% of his max HP dealt. This armor caps at 400 and decays at a rate of 40 per second.

Boss Encounter

Phase 1

Mithrix starts the battle with basic attacks, which consist of running towards the player, swiping with his hammer for 200% damage, smashing the ground with his hammer causing an explosion for 1200% damage (with damage falloff) and an additional 1200% damage on a direct hit (although the hitbox is fairly small). He can also dash sideways, cleansing all debuffs from him. After taking enough damage, he will jump into the air of the center of the stage and slam down, causing a ring-shaped shock wave around the stage which deals 400% damage and Status Cripple.png cripples the player. The shock wave ends when it reaches the thin line of rocks between the platform where he is first seen. He will then immediately run towards the player while firing up to 12 needles for 60% damage each.

Phase 2

Mithrix leaves the arena, and several stone pillars rise up around the arena. In place of Mithrix himself, several Lunar Chimera (Golem).png Lunar Chimera Golems, Lunar Chimera (Wisp).png Lunar Chimera Wisps, and Lunar Chimera (Exploder).png Lunar Chimera Exploders are summoned and must be defeated. New chimeras are occasionally summoned as the player destroys the initial ones.

Phase 3

Mithrix returns with more powerful and different attacks, occasionally summoning Lunar Chimera Golems, Lunar Chimera Exploders, and more rarely, Lunar Chimera Wisps. His moveset is similar to the first phase, but the attacks have additional effects to them. He also becomes more aggressive and attacks more often. His slam leaves a lingering pillar of flames that deals 150% damage per tick and sends 3 small, directional shockwaves similar to the shockwaves from his jump slam attack, dealing 200% damage and applying Cripple. Mithrix also gains an additional attack (which always occurs shortly after the jump slam) in which he summons moving radial lines of flame that spin around him and explode after short delay, dealing 900% damage and applying Cripple to allies caught in the lines. This occurs 5 times in a row, with varying speed and direction of the lines' spin.

Phase 4

Mithrix steals all players' items and gains their buffs, except for equipment, Spinel Tonic.png Tonic AfflictionsBgLunar.pngSpinel Tonic.png60sGain a massive boost to ALL stats. Chance to gain an affliction that reduces ALL stats.
Drink the Tonic, gaining a boost for 20 seconds. Increases damage by +100%. Increases attack speed by +70%. Increases armor by +20. Increases maximum health by +50%. Increases passive health regeneration by +300%. Increases movespeed by +30%.

When the Tonic wears off, you have a 20% chance to gain a Tonic Affliction, reducing all of your stats by -5% (-5% per stack).
, Halcyon Seed.png Halcyon SeedsBgBoss.pngHalcyon Seed.pngSummon Aurelionite during the Teleporter event.
Summon Aurelionite during the teleporter event. It has 100% (+50% per stack) damage and 100% (+100% per stack) health.
, or Heretic.png Heresy Items. Damaging him will release the items, 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. He will fire a burst of projectiles and slowly stomp around the battlefield. At low enough health, he will begin to occasionally kneel and fire fast-moving orbs for 400% damage in eight directions, simultaneously dealing 8% of his current health in damage to himself. If the player has any Halcyon Seeds, Aurelionite.png Aurelionite will spawn and help the player during this phase. Hitting Mithrix with high damage in this phase will stagger him.

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 Band.png Kjaro's BandBgUncommon.pngKjaro's Band.pngHigh 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 an quick completion of this phase.

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 Reaver.png Void Reavers and Lunar Chimera (Wisp).png Lunar Chimera (Exploder).png Lunar Chimera (Golem).png Chimeras 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 Captain.png Captain as a playable Survivor. Additionally, on Monsoon.png Monsoon difficulty, it will complete the The Calm challenge and unlock Purity.png PurityBgLunar.pngPurity.pngReduce 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.

Tips

  • 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.
  • On-kill items, such as Topaz Brooch.png Topaz BroochBgCommon.pngTopaz Brooch.pngGain a temporary barrier on kill.
    Gain a temporary barrier on kill for 15 health (+15 per stack).
    and Will-o'-the-wisp.png Will-o'-the-wispBgUncommon.pngWill-o'-the-wisp.pngDetonate 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 take but cannot use Tougher Times.png Tougher TimesBgCommon.pngTougher Times.pngChance to block incoming damage.
    15% (+15% per stack) chance to block incoming damage. Unaffected by luck.
    , Razorwire.png RazorwireBgUncommon.pngRazorwire.pngRetaliate 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
    , and Mired Urn.png Mired UrnsBgBoss.pngMired Urn.pngSiphon 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.
    during Phase 4.
  • If Mithrix takes a Purity.png PurityBgLunar.pngPurity.pngReduce 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 the Captain's Defensive Microbots.png Defensive MicrobotsBgLegendary.pngDefensive Microbots.pngShoot 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.
    as well as any Medkit.png MedkitsBgCommon.pngMedkit.pngReceive a delayed heal after taking damage.
    2 seconds after getting hurt, heal for 20 plus an additional 5% (+5% per stack) of maximum health.
    during Phase 4, making the fight significantly harder until they are recovered.
  • Mithrix will take Dio's Best Friend.png Dio's Best FriendBgLegendary.pngDio's Best Friend.pngCheat 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 SwarmsArtifact of Swarms is enabled, two Mithrix 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 Mithrix use their fire wheel attack at once, making it exceedingly difficult to dodge.
  • Mithrix steals items from minions, like Engineer.png Engineer's turrets, but does not use them.
  • During Phase 4, Mithrix will not use his orb attack while his health is above a certain threshold.
  • If the player has any Fuel Cell.png Fuel CellsBgUncommon.pngFuel Cell.pngHold an additional equipment charge. Reduce equipment cooldown.
    Hold an additional equipment charge (+1 per stack). Reduce equipment cooldown by 15% (+15% per stack).
    before Phase 4, additional equipment charges remain even after Mithrix takes all the player's items. This can be used to easily finish him off with the Disposable Missile Launcher.png Disposable Missile LauncherBgEquipment.pngDisposable Missile Launcher.png45sFire a swarm of missiles.
    Fire a swarm of 12 missiles that deal 12x300% damage.
    , Preon Accumulator.png Preon AccumulatorBgEquipment.pngPreon Accumulator.png140sFire a ball of energy that electrocutes nearby enemies before detonating.
    Fires preon tendrils, zapping enemies within 35m for up to 600% damage/second. On contact, detonate in an enormous 20m explosion for 4000% damage.
    , Royal Capacitor.png Royal CapacitorBgEquipment.pngRoyal Capacitor.png20sCall down a lightning strike on a targeted monster.
    Call down a lightning strike on a targeted monster, dealing 3000% damage and stunning nearby monsters.
    , etc.
  • During Phase 4, the Solus Probe.png Solus Probes spawned from Empathy Cores.png Empathy CoresBgBoss.pngEmpathy Cores.pngRecruit 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 noticably 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 Gland.png Queen's GlandBgBoss.pngQueen's Gland.pngRecruit 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 Guard.png Beetle Guard ally he will gain is much stronger than a normal Beetle Guard.
  • Captain.png Captain's OGM-72 'DIABLO' Strike.png OGM-72 'DIABLO' Strike 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 Crowbar.png CrowbarsBgCommon.pngCrowbar.pngDeal bonus damage to enemies above 90% health.
    Deal +75% (+75% per stack) damage to enemies above 90% health.
    , Runald's Band.png Runald's BandsBgUncommon.pngRunald's Band.pngHigh 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 Glass.png Shaped GlassBgLunar.pngShaped Glass.pngDouble 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 Band.png Kjaro's BandBgUncommon.pngKjaro's Band.pngHigh 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.

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.

Version History

PS4 & Xbox One Patch
  • Bug Fixes
    • Solved an issue where the game would freeze during the last Mithrix phase as the Heretic.png Heretic.

PC Patch v1.1.1.2
  • Bug Fixes
    • Fixed a crash during the last boss fight

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 Crowbar.png CrowbarsBgCommon.pngCrowbar.pngDeal 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

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

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 Urn.png Mired UrnBgBoss.pngMired Urn.pngSiphon 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 Crowbar.png CrowbarsBgCommon.pngCrowbar.pngDeal 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 (Razorwire.png RazorwireBgUncommon.pngRazorwire.pngRetaliate 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 Times.png Tougher TimesBgCommon.pngTougher Times.pngChance 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 Turret.png Engineer Turrets. He won’t use the items he takes from minions.
      • Minions can now retrieve items for their owner.
    • Add visual effect to Unstable Tesla Coil.png Tesla CoilBgLegendary.pngUnstable Tesla Coil.pngShock 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

Early Access Content Update 5
  • Major Content
    • Added New Final Boss: ???
    • Added New Monster Lore Entry: ???

Dialogue

Mithrix is unique in that he speaks throughout his fight, with his 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 Heretic)

  • 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 (late phases)

  • 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 (late phases)

  • 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 (late phases)

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

The Player has Halcyon Seed (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...
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