Risk of Rain 2 Wiki
REX is a half robot / half plant that uses HP to cast devastating skills from a distance. The plant nor the robot could survive this planet alone – but thankfully they have each other.
Health 130 (+39 per level)
Health Regen 1/s (+0.2 per level)
Damage 12 (+2.4 per level)
Speed 7 m/s
Armor 20
Unlock Power Plant

Umbra Title
Ending Phrase
Escaped : ..and so it left, ready to grow into something more.

Vanished : ..and so it vanished, still remaining as one.

REX is a playable character in Risk of Rain 2.

Their attacks are powerful and strike from a great distance, but in exchange, some require REX's health as a resource. To counteract this, their skills also focus on Status Weak.png weakening opponents to help REX deal more damage and take less, and others drain health from enemies to recoup HP costs. As a result, REX's health may change rapidly during combat, but they will always be relatively safe with enough skill.



Natural Toxins

Natural Toxins.png
Type Passive
Description Certain attacks Weaken
[ Weaken ]
Reduce movement speed and damage by 40%. Reduce armor by 30.
enemies hit, reducing their movement speed, armor, and damage.
  • Note: The in-game description of -20 armor is incorrect, it is actually -30 armor.
  • Lasts 3 seconds.


DIRECTIVE Inject.png
Type Primary
Proc Coefficient 3x 0.5
Description Fire 3 syringes for 3x80% damage. The last syringe Weakens
[ Weaken ]
Reduce movement speed and damage by 40%. Reduce armor by 30.
and heals for 60% of damage dealt.
  • Burst duration is 0.2 seconds and the animation duration is 0.6 seconds.
  • Each shot of the burst can crit independently.


Type Secondary
Cooldown 6s
Proc Coefficient 0.5 per hit
Description Launch a series of seed bullets into the sky, raining down for 450% damage per second.
  • Unlocked via the REX: Bushwhacked Challenge. (As REX, complete an entire teleporter event while under 50% health.)
  • Hits 16 times for 90% damage over 3s (1440% damage total)

Seed Barrage

Seed Barrage.png
Type Secondary
Cooldown 0.5s
Proc Coefficient 1
Description 15% HP
[ X% HP ]
The skill costs X% of your current health.
. Launch a mortar into the sky for 450% damage.


DIRECTIVE Disperse.png
Type Utility
Cooldown 5.5s
Proc Coefficient 0
Description Fire a Sonic Boom
[ Sonic Boom ]
Pushes away all enemies hit. Pushes you backwards if you are airborne.
that Weakens
[ Weaken ]
Reduce movement speed and damage by 40%. Reduce armor by 30.
all enemies hit.
  • Pushing force varies depending on the size of the enemy, with bosses being pushed the least.
  • When used in the air, this skill knocks REX back towards the camera a significant amount.

Bramble Volley

Bramble Volley.png
Type Utility
Cooldown 5.5s
Proc Coefficient 0.5
Description 20% HP
[ X% HP ]
The skill costs X% of your current health.
. Fire a Sonic Boom
[ Sonic Boom ]
Pushes away all enemies hit. Pushes you backwards if you are airborne.
that damages enemies for 550% damage. Heals for every target hit.


DIRECTIVE Harvest.png
Type Special
Cooldown 6s
Proc Coefficient 1
Description Fire a bolt that deals 330% damage and injects an enemy. On death, drop multiple healing fruits that heal for 25% HP.
  • Unlocked via the REX: Full of Life challenge. (As REX, heal for 1000 health at once.)
  • The mark lasts 10 seconds before expiring.
  • Has a slight area of effect, so multiple enemies can become marked from a single cast.
  • Spawns 2 - 8 fruits (scales with enemy max HP) when the marked target is killed. Fruits last 20 seconds.

Tangling Growth

Tangling Growth.png
Type Special
Cooldown 12s
Proc Coefficient Projectile: 1
Roots: 0
Description 25% HP
[ X% HP ]
The skill costs X% of your current health.
. Fire a flower that roots for 200% damage. Heals for every target hit.
  • Takes a full second to unfurl, then remains active for 8 seconds.
  • Heals REX for an estimated 1.5% of their max HP every second per snared target.


  • All skills that require health to use do so in a manner similar to a Shrine of Blood, although they take a percentage of REX's current health instead of their maximum. This means:
    • The percentage of health taken is calculated from REX's current health plus current shield, but does not account for barriers.
    • Like regular damage, barrier is consumed first, then shields, then health.
    • The damage can be mitigated with Repulsion Armor Plate.png Repulsion Armor PlateBgCommon.pngRepulsion Armor Plate.pngReceive flat damage reduction from all attacks.
      Reduce all incoming damage by 5 (+5 per stack). Cannot be reduced below 1.
      or blocked entirely by Tougher Times.png Tougher TimesBgCommon.pngTougher Times.pngChance to block incoming damage.
      15% (+15% per stack) chance to block incoming damage. Unaffected by luck.
      • Uniquely, the damage taken from Tangling Growth is not reduced by the Repulsion Armor Plate.
    • The damage will activate the Medkit.png MedkitBgCommon.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.
      , Planula.png PlanulaBgBoss.pngPlanula.pngReceive flat healing when attacked.
      Heal from incoming damage for 15 (+15 per stack).
      and 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
  • The Primordial Cube.png Primordial CubeBgEquipment.pngPrimordial Cube.png60sFire a black hole that draws enemies in.
    Fire a black hole that draws enemies within 30m into its center. Lasts 10 seconds
    can be particularly effective on REX when used in conjunction with Tangling Growth. Use the black hole to gather up enemies and launch Tangling Growth into them, or pull enemies towards an already-planted Growth.
  • REX can make good use of the Old War Stealthkit.png Old War StealthkitBgUncommon.pngOld War Stealthkit.pngTurn invisible at low health.
    Falling below 25% health causes you to gain 40% movement speed and invisibility for 5s. Recharges every 30 seconds (-50% per stack).
    , as they are much more likely to be at low health than other Survivors.
  • Similarly, REX can activate the Genesis Loop.png Genesis LoopBgBoss.pngGenesis Loop.pngFire an electric nova at low health.
    Falling below 25% health causes you to explode, dealing 6000% base damage. Recharges every 30 / (2 +1 per stack) seconds .
    with ease and relative safety by using self-damaging abilities to reduce their health and following up with healing abilities.
    • However, if the CommandArtifact of Command is active, other boss items, like Planula.png PlanulaBgBoss.pngPlanula.pngReceive flat healing when attacked.
      Heal from incoming damage for 15 (+15 per stack).
      or on-hits like Shatterspleen.png ShatterspleenBgBoss.pngShatterspleen.pngCritical strikes always bleed enemies. Bleeding enemies now explode.
      Gain 5% critical chance. Critical Strikes bleed enemies for 240% base damage. Bleeding enemies explode on death for 400% (+400% per stack) damage, plus an additional 15% (+15% per stack) of their maximum health.
      , may be preferable.
  • Walking backwards, jumping, and using DIRECTIVE: Disperse at a downward angle can launch REX quite a long distance in a desirable direction.
  • Using DIRECTIVE: Disperse 3 times in midair with a Hardlight Afterburner.png Hardlight AfterburnerBgLegendary.pngHardlight Afterburner.pngAdd 2 extra charges of your Utility skill. Reduce Utility skill cooldown.
    Add +2 (+2 per stack) charges of your Utility skill. Reduces Utility skill cooldown by 33%.
    will push the player backwards at very high speed.
    • The Afterburner reduces the cooldown enough that REX can effectively fly everywhere, although it is somewhat challenging to control.
  • Using Seed Barrage resets the attack cooldown of DIRECTIVE: Inject, allowing REX to attack much faster than normal.
  • It is highly recommended that the player avoids the Transcendence.png TranscendenceBgLunar.pngTranscendence.pngConvert all your health into shield. Increase maximum health.
    Convert all but 1 health into regenerating shields. Gain 50% (+25% per stack) maximum health.
    , Wake of Vultures.png Wake of VulturesBgLegendary.pngWake of Vultures.pngTemporarily steal the power of slain elites.
    Gain the power of any killed elite monster for 8s (+5s per stack).
    , and Shared Design.png Shared DesignBgEquipment.pngShared Design.pngBecome an aspect of perfection. when playing REX. These items can replace health with shields, which cannot be recovered from healing and only recover over time after avoiding damage. This can totally cripple REX as their abilities Tangling Growth, Seed Barrage, and Bramble Volley take a percentage of health, but it cannot be recovered by using Tangling Growth, DIRECTIVE: Inject, or Bramble Volley.
  • It is highly recommended to avoid 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.
    when playing REX, as using any self-damaging skill will cause the player to lose large amounts of gold.
  • Natural Toxins, Tangling Growth, & DIRECTIVE: Harvest all inflict debuffs innately, allowing REX to activate the Death Mark.png Death MarkBgUncommon.pngDeath Mark.pngEnemies with 4 or more debuffs are marked for death, taking bonus damage.
    Enemies with 4 or more debuffs are marked for death, increasing damage taken by 50% from all sources for 7 (+7 per stack) seconds.
    with only 2 additional debuffs.
  • Due to the high health-to-HP-gain ratio of Bramble Volley, it is often recommended to take it over DIRECTIVE: Disperse. In addition, Bramble Volley can be used to knock oneself back in the same manner as DIRECTIVE: Disperse, meaning that no mobility is lost.
  • Tangling Growth's root can be used to entirely hold down areas, regain good amounts of HP, and lock enemies in place to strike them all at once with Seed Barrage, DIRECTIVE: Drill, orBramble Volley.
  • Tangling Growth can root the Mithrix.png final boss, greatly restricting his movement. This is not quite as effective as outright freezing him as Artificer.png Artificer, however.
  • Tangling Growth can slam flying enemies into terrain for high damage. This can be used to easily defeat the Alloy Worship Unit.png Alloy Worship Unit by smashing it into the central pillar at the right angle.



“Status Report on Hydroponics Unit. Serial key begins with 12ea031lsd095a-“

“Yes, 12ea03. Tasked with care for the cabbage, lettuce, and mizuna growths. About 250 plants total. Stable, but losing biomass. I think there are issues with the microgravity. ”

“Keep an eye on the biomass, we might have to scrap 12ea03 and replace it with one of our evergreen Units. Moving on… serial key crp012d054jd0-“

“Crp01 is doing alright. Tasked with corn. About 80 plants total. Lost 6, down to 74.” 

“Sustainable, I suppose. What about… serial key rex0ch12d66m-“

“Oh, that Unit. Yeah, it was tasked with care for one of our cabbage hybrids. To be quite frank… it turned out terrible. I think we started with 80 units, but we’ve lost 79. The hybrid species just isn’t spliced right, I think. There was no way to sustain them.”

“And status report on the Unit?”

“Uh, well… it’s out on the star deck. It managed to hoist the last hybrid onto its platform base, and it’s been walking around the ship ever since, chasing down starlight. ”

“…What? The Unit left Hydroponics? 

“Yes, but-“

“So the Unit is disengaging from protocol?”

“Well, yes, but-“

“And instead of terminating the Unit, you let it roam around the ship unsupervised?”

“Just the team, well we just- we just kinda feel bad for the thing, you know. It’s trying really hard to keep that last hybrid alive, and-“

“Go terminate the Unit.”

“Well, the thing is- Rex is actually doing a great job! The hybrid’s biomass-“

“Are you kidding? Terminate the Unit. You have no idea what happens to a robot once it disengages from protocol. You are putting the life of your entire team in danger for the sake of a stray hydroponics unit. This should not even be a discussion.”


“Yes, sir.”

Transcriptions complete.

Version History

Anniversary Update
  • Major Content
    • Added New Skill Variant: DIRECTIVE Harvest.png REX Special
      • Fire a bolt that deals 330% damage and injects an enemy. On death, drop multiple healing fruits that heal for 25% HP.
    • Added New Class Challenge: DIRECTIVE Harvest.png REX: Full of Life

PC Patch v1.0.1.1 (Build ID No.5440050)
  • Bug Fixes
    • Fix REX being executed by freezes
      [ Freezing ]
      Freeze enemies in place. Frozen enemies are instantly killed if below 30% health.

Early Access Content Update 5

Early Access Artifacts Content Update
  • Gameplay Changes
    • Bramble Volley.png Bramble Volley
      • Cooldown: 2.0s ⇒ 5.0s
      • Proc Coefficient: 0 ⇒ 0.5
      • Developer Notes: Cooldowns aren’t displayed anywhere in character select, and are generally a lame way to balance Skill Variants
  • Bug Fixes
    • 🌧 Fix Smoothie.png REX: Mastery achievement icon using old Smoothie skin colors
    • 🌧 Clarify Rex's passive description to be a bit more accurate

Early Access Hidden Realms Content Update
  • Major Content
    • Added New Skill Variant: Bramble Volley.png REX Utility
      • Costs 20% of your current health. Fire thorns that pushes and damages all enemies hit for 550% damage. Pushes you backwards if you are airborne. Heals for every target hit.
    • Added New Class Challenge: Bramble Volley.png REX: Dunked
  • Gameplay Changes
    • Update “Smoothie.png Smoothie” skin to have fall colors and unique textures
    • DIRECTIVE Inject.png DIRECTIVE: Inject
      • Burst Duration: 0.3s ⇒ 0.2s
      • Animation Duration: 1s ⇒ 0.6s
      • Heal Percentage: 30% ⇒ 60%
    • DIRECTIVE Drill.png Seed Volley
      • Renamed DIRECTIVE: Drill
      • HP Cost: 30% ⇒ 0%
      • Tweak visuals and icons so its more mechanical and less flowery

Early Access 'Skills 2.0' Content Update
  • Major Content and Changes
    • Added New Skill Variant: DIRECTIVE Drill.png REX Secondary
      • Launch a series of seed bullets into the sky, raining down for 450% damage per second.
    • Added New Skin: Smoothie.png REX
    • Added New Class Challenge: DIRECTIVE Drill.png REX: Bushwhacked
    • Added New Class Challenge: Smoothie.png REX: Mastery
    • Added New Survivor Lore Entry: REX
  • Gameplay Changes
    • Add 2 new skill variants
    • Add 1 new skin

Early Access Patch (Build ID No.3961583)
  • Bug Fixes
    • Immune characters can no longer block "armor piercing" health costs (Blood Shrines, REX abilities)
    • Improve performance on REX's entangle graphics

Early Access Scorched Acres Content Update
  • Major Content and Changes
    • Added New Survivor: REX



  • REX is referred to internally as "Treebot."
  • The Smoothie skin used to be a light green & pink with blue flowers.