REX

REX
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	1.5/s (+0.3 per level) 1/s (+0.2 per level) 0.6/s (+0.12 per level)
Damage	12 (+2.4 per level)
Speed	7 m/s
Armor	20 ( 90)
Unlock	Power Plant
Umbra Title
Symbiotes
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.

REX’s attacks are powerful and strike from a great distance, but in exchange, some require REX's health as a resource. Proper skill timing and health management are required to keep REX in the fight. In addition to health stealing and powerful group management, REX can put weakeningWeak (Debuff)
Reduces armor by 30, reduces movement speed and damage by 40%. on opponents to help REX deal more damage and take less.

Completing the Power Plant challenge will unlock REX as a playable survivor.

Skills

Passive

Natural Toxins
	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.
Notes
Note: The in-game description of -20 armor is incorrect. It is actually -30 armor. Lasts 3 seconds.

Primary

DIRECTIVE: Inject
	Type	Primary
	Proc Coefficient	0.5 x 3
	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.
Notes
Burst duration is 0.2 seconds and the animation duration is 0.6 seconds. Each shot of the burst can crit independently. The shots fire in a narrow horizontal fan, meaning that landing all 3 hits against distant targets may be difficult.

Secondary

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

Seed Barrage
	Type	Secondary
	Cooldown	0.5s
	Proc Coefficient	1.0
	Description	15% HP. Launch a mortar into the sky for 450% damage.

Utility

DIRECTIVE: Disperse
	Type	Utility
	Cooldown	5.5s
	Proc Coefficient	0.0
	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.
Notes
The knockback from the skill varies depending on the size of the target; larger enemies are pushed less than small ones. When used in the air, this skill knocks REX back towards the camera a significant amount.

Bramble Volley
	Type	Utility
	Cooldown	5.5s
	Proc Coefficient	0.5
	Description	20% HP. 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.
Notes
Unlocked via the REX: Dunked Challenge. (As REX, kill a Clay Dunestrider on Abandoned Aqueduct by throwing it into a pit.) Heals REX for 10% of their max HP per target hit. The knockback from the skill varies depending on the size of the target; larger enemies are pushed less than small ones. Also pushes REX back while in the air.

Special

DIRECTIVE: Harvest
	Type	Special
	Cooldown	6s
	Proc Coefficient	1.0
	Description	Fire a bolt that deals 330% damage and injects an enemy. On death, drop multiple healing fruits that heal for 25% HP.
Notes
Unlocked via the REX: Full of Life Challenge. (As REX, heal for 1000 health at once.) Inflicts the FruitingFruiting (Debuff) Spawn 2-8 healing fruits on death. debuff, which lasts 10 seconds. The attack has a slight area of effect, so multiple enemies can be inflicted with Fruiting at once if they are close together. When a Fruiting enemy is killed, it drops 2-8 fruits (scaling with the enemy's max HP) that last 20 seconds.

Tangling Growth
	Type	Special
	Cooldown	12s
	Proc Coefficient	Projectile: 1.0 Roots: 0.0
	Description	25% HP. Fire a flower that roots for 200% damage. Heals for every target hit.
Notes
The flower requires 1 second to unfurl after hitting terrain or an enemy, then remains active for 8 seconds. The flower's area of effect is indicated by a 10m green ring around itself. When an enemy enters the ring, it becomes entangledEntangle (Debuff) Drastically reduce movement speed.Reduce movement speed to 0. and is pulled towards the flower. Heals REX for an estimated 1.5% of their max HP every second per snared target. Even after an entangled enemy is killed, it will continue to heal REX until the flower expires. The flower can deal a total of 400% damage, 200%, on impact, and 200% on pull.

Behaviors

For an explanation of how these behaviors are implemented read about Enemy AI. This section only applies when the character is controlled by AI.

1. Use special and flee: REX must be within 8m from the target.
2. Use special: REX must be within 25m from the target, have line of sight, and be aiming at it.
3. Use secondary and stop: REX must be above 50% health, have line of sight to the target, and be aiming at it. A new target will be selected after this and the behavior cannot be selected twice in a row.
4. Use primary and strafe: REX must be within 20m from the target, have line of sight, and be aiming at it. A new target will be selected after this and the behavior cannot be selected twice in a row.
5. Use primary and chase: REX must be within 30m from the target, have line of sight, and be aiming at it. A new target will be selected after this. If REX is within 20m from the target and the other skills are on cooldown, it will alternate between strafing and chasing the target while using the primary.
6. Chase while using primary: no requirements. Unlike the majority of entities which just chase their targets if they have nothing else to do, REX will do so while constantly using the primary.

Tips

• 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 and barrier.
  • Like regular damage, barrier is consumed first, then shields, then health.
  • The damage can be mitigated with 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. or blocked entirely by Tougher TimesTougher Times
    Chance 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. This may be an oversight.
      • PlanulaPlanula
        Receive flat healing when attacked.
        Heal from incoming damage for 15 (+15 per stack). will also not active when using this skill.
  • The damage will activate the MedkitMedkit
    Receive a delayed heal after taking damage.
    2 seconds after getting hurt, heal for 20 plus an additional 5% (+5% per stack) of maximum health., PlanulaPlanula
    Receive flat healing when attacked.
    Heal from incoming damage for 15 (+15 per stack). and 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.
• It may be tempting to prioritize healing items to recoup HP costs for REX's skills. However, since they restore a percentage of max HP, their healing scales well into the endgame without much need for other sources of healing.
  • This also means that the normally-situational N'kuhana's OpinionN'kuhana's Opinion
    Fire haunting skulls when healed.
    Store 100% (+100% per stack) of healing as Soul Energy. After your Soul Energy reaches 10% of your maximum health, fire a skull that deals 250% of your Soul Energy as damage. and AegisAegis
    Healing past full grants you a temporary barrier.
    Healing past full grants you a temporary barrier for 50% (+50% per stack) of the amount you healed. will always be useful for REX.
• The Primordial Cube60sPrimordial Cube
  Fire 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 StealthkitOld War Stealthkit
  Turn 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 LoopGenesis Loop
  Fire 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.
• Walking backwards, jumping, and using DIRECTIVE: Disperse at a downward angle can launch REX notably upwards.
• Using DIRECTIVE: Disperse 3 times in midair with a Hardlight AfterburnerHardlight Afterburner
  Add 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 a 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 prevents the ending lag of DIRECTIVE: Inject, allowing REX to attack much faster than normal at the cost of the HP.
• It is highly recommended that the player avoid TranscendenceTranscendence
  Convert 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 VulturesWake of Vultures
  Temporarily steal the power of slain elites.
  Gain the power of any killed elite monster for 8s (+5s per stack)., Silence Between Two StrikesSilence Between Two Strikes
  Become an aspect of lightning., and Shared DesignShared Design
  Become 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 abilities such as Tangling Growth, Seed Barrage, and Bramble Volley take a percentage of health, but do not rebuild shield. Additionally, using any self-damaging skill will reset the 7 second period necessary to recover shields.
• It is highly recommended to avoid the 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., as using any self-damaging skill will immediately cause the player to lose large amounts of gold.
• Natural Toxins, Tangling Growth, & DIRECTIVE: Harvest all inflict debuffs innately, making it easy for REX to apply Death MarkDeath Mark
  Enemies 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 the addition of two status effects.
• 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 can be used to regain large amounts of HP and lock enemies in place to strike them all at once with Seed Barrage, DIRECTIVE: Drill, or Bramble Volley.
  • Having GasolineGasoline
    Killing an enemy ignites other nearby enemies.
    Killing an enemy ignites all enemies within 12m (+4m per stack) for 150% base damage. Additionally, enemies burn for 150% (+75% per stack) base damage. or 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. can inflict huge damage on the rooted enemies, as they are all pulled very close together.
• Tangling Growth can root the final bossMithrix
  King of NothingHP: 1000 (+300 per level)
  Damage: 16 (+3.2 per level)
  Class: Melee / Ranged
  Speed: 15 m/s
  Armor: 20, greatly restricting his movement. However, he is still capable of dashing to break free (which removes his debuffs as well), so this is not quite as effective as outright freezing him as ArtificerArtificerThe 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.
• Tangling Growth can slam flying enemies into terrain for high damage. This can be used to easily defeat the Alloy Worship UnitAlloy Worship Unit
  Friend of VulturesHP: 2500 (+750 per level)
  Damage: 15 (+3 per level)
  Class: Ranged
  Speed: 7 m/s
  Armor: 30 by smashing it into the central pillar at the right angle.

Lore

//--AUTO-TRANSCRIPTION FROM HYDROPONICS BAY OF UES [Redacted]--//

“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

• 

  Default

• 

  Smoothie

• 

  Verdant

Trivia

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

Version History

Anniversary Update

• Major Content
  • Added New Skill Variant: REX SpecialDIRECTIVE: Harvest (Special)Fire a bolt that deals 330% damage and injects an enemy. On death, drop multiple healing fruits that heal for 25% HP.
    Survivor: REX
    • 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: REX: Full of LifeDIRECTIVE: Harvest (Special)Fire a bolt that deals 330% damage and injects an enemy. On death, drop multiple healing fruits that heal for 25% HP.
    Survivor: REX

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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

• Bug Fixes
  • Fixed immobilization from REX’s Tangling GrowthTangling Growth (Special)25% HP. Fire a flower that roots for 200% damage. Heals for every target hit.
    Survivor: REX becoming permanent if using Wax QuailWax Quail
    Jumping while sprinting boosts you forward.
    Jumping while sprinting boosts you forward by 10m (+10m per stack). while affected, which would also sometimes lead to a crash upon getting killed
• (Undocumented) Updated description for Natural ToxinsNatural Toxins (Passive)Certain attacks Weaken enemies hit, reducing their movement speed, armor, and damage.
  Survivor: REX, DIRECTIVE: InjectDIRECTIVE: Inject (Primary)Fire 3 syringes for 3x80% damage. The last syringe Weaken and heals for 60% of damage dealt.
  Survivor: REX, Seed BarrageSeed Barrage (Secondary)15% HP. Launch a mortar into the sky for 450% damage.
  Survivor: REX, DIRECTIVE: DisperseDIRECTIVE: Disperse (Utility)Fire a Sonic Boom that Weaken all enemies hit.
  Survivor: REX, Bramble VolleyBramble Volley (Utility)20% HP. Fire a Sonic Boom that damages enemies for 550% damage. Heals for every target hit.
  Survivor: REX to include keywords

---

Early Access Artifacts Content Update

• Gameplay Changes
  • Bramble VolleyBramble Volley (Utility)20% HP. Fire a Sonic Boom that damages enemies for 550% damage. Heals for every target hit.
    Survivor: REX
    • 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 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: REX UtilityBramble Volley (Utility)20% HP. Fire a Sonic Boom that damages enemies for 550% damage. Heals for every target hit.
    Survivor: REX
    • 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: REX: DunkedBramble Volley (Utility)20% HP. Fire a Sonic Boom that damages enemies for 550% damage. Heals for every target hit.
    Survivor: REX
• Gameplay Changes
  • Update “ Smoothie” skin to have fall colors and unique textures
  • DIRECTIVE: InjectDIRECTIVE: Inject (Primary)Fire 3 syringes for 3x80% damage. The last syringe Weaken and heals for 60% of damage dealt.
    Survivor: REX
    • Burst Duration: 0.3s ⇒ 0.2s
    • Animation Duration: 1s ⇒ 0.6s
    • Heal Percentage: 30% ⇒ 60%
  • Seed VolleyDIRECTIVE: Drill (Secondary)Launch a series of seed bullets into the sky, raining down for 450% damage per second.
    Survivor: REX
    • Renamed DIRECTIVE: Drill
    • HP Cost: 30% ⇒ 0%
    • Tweak visuals and icons so its more mechanical and less flowery

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Early Access 'Skills 2.0' Content Update

• Major Content and Changes
  • Added New Skill Variant: REX SecondaryDIRECTIVE: Drill (Secondary)Launch a series of seed bullets into the sky, raining down for 450% damage per second.
    Survivor: REX
    • Launch a series of seed bullets into the sky, raining down for 450% damage per second.
  • Added New Skin: REX
  • Added New Class Challenge: REX: BushwhackedDIRECTIVE: Drill (Secondary)Launch a series of seed bullets into the sky, raining down for 450% damage per second.
    Survivor: REX
  • Added New Class Challenge: REX: Mastery
  • Added New Survivor Lore Entry: REX
• Gameplay Changes
  • Add 2 new skill variants
  • Add 1 new skin

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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

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Early Access Scorched Acres Content Update

• Major Content and Changes
  • Added New Survivor: REX