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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. They use powerful attacks that cost HP, but heal HP from some attacks, so their HP may change rapidly while using abilities. To increase consistency and survivability, their passive helps REX deal more damage while also taking less.

Skills[edit | edit source]


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 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 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.

Tips[edit | edit source]

  • The Primordial Cube.pngPrimordial 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.
  • Items that trigger upon taking damage (such as Razorwire.pngRazorwireBgUncommon.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
    ) can be very effective, especially if using Seed Barrage.
  • 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.pngHardlight 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 Transcendence.pngTranscendenceBgLunar.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.
    and Wake of Vultures.pngWake 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).
    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.pngBrittle 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 gold rapidly.
  • Natural Toxins, Tangling Growth, & DIRECTIVE: Harvest all count as debuffs, allowing REX to activate Death Mark.pngDeath 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 as opposed to the usual 4.
  • 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 as well, and as such can be used for mobility in the same manner as DIRECTIVE: Disperse.
  • Tangling Growth's root can be used to entirely hold down areas, regain good amounts of HP, and lock enemies in place for either a Seed Barrage, DIRECTIVE: Drill volley, or a Bramble Volley.
  • Tangling Growth can root the Mithrix.png final boss, although this is not quite as effective as outright freezing him as Artificer.png Artificer.
  • 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.

Lore[edit | edit source]


“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.

Gallery[edit | edit source]

Trivia[edit | edit source]

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