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 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.

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

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 or blocked entirely by.
 * Uniquely, the damage taken from is not reduced by the Repulsion Armor Plate.
 * The damage will activate the,  and.
 * The can be particularly effective on REX when used in conjunction with . Use the black hole to gather up enemies and launch  into them, or pull enemies towards an already-planted Growth.
 * REX can make good use of the, as they are much more likely to be at low health than other Survivors.
 * Similarly, REX can activate the 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 at a downward angle can launch REX quite a long distance in a desirable direction.
 * Using 3 times in midair with a  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 resets the attack cooldown of, allowing REX to attack much faster than normal.
 * It is highly recommended that the player avoids the, , , and 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 , , and  take a percentage of health, but it cannot be recovered by using , , or . Additionally, using any self-damaging skill will reset the 7 second period necessary to recover shields.
 * It is highly recommended to avoid the, as using any self-damaging skill will immediately cause the player to lose large amounts of gold.
 * ,, & all inflict debuffs innately, allowing REX to activate the  with only 2 additional debuffs.
 * Due to the high health-to-HP-gain ratio of, it is often recommended to take it over . In addition, can be used to knock oneself back in the same manner as , meaning that no mobility is lost.
 * can be used to entirely hold down areas, regain large amounts of HP, and lock enemies in place to strike them all at once with, , or.
 * Having  or  can inflict huge damage on the rooted enemies, as they are all pulled very close together.
 * can root the, greatly restricting his movement. This is not quite as effective as outright freezing him as , however.
 * can slam flying enemies into terrain for high damage. This can be used to easily defeat the by smashing it into the central pillar at the right angle.
 * ’s healing on hit does not work with Aegis. It will not generate Barrier.

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:
 * 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:
 * PC Patch v1.0.1.1 (Build ID No.5440050)
 * Bug Fixes
 * Fix REX being executed by
 * Early Access Content Update 5
 * Bug Fixes
 * Fixed immobilization from REX’s becoming permanent if using  while affected, which would also sometimes lead to a crash upon getting killed
 * (Undocumented) Updated description for, , , , to include keywords
 * Early Access Artifacts Content Update
 * Gameplay Changes
 * 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 achievement icon using old Smoothie skin colors
 * 🌧 Clarify Rex's passive description to be a bit more accurate
 * 🌧 Clarify Rex's passive description to be a bit more accurate
 * Early Access Hidden Realms Content Update
 * Major Content
 * Added New Skill Variant:
 * 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:
 * Gameplay Changes
 * Update “” skin to have fall colors and unique textures
 * Burst Duration: 0.3s ⇒ 0.2s
 * Animation Duration: 1s ⇒ 0.6s
 * Heal Percentage: 30% ⇒ 60%
 * Renamed DIRECTIVE: Drill
 * HP Cost: 30% ⇒ 0%
 * Tweak visuals and icons so its more mechanical and less flowery
 * 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:
 * Launch a series of seed bullets into the sky, raining down for 450% damage per second.
 * Added New Skin:
 * Added New Class Challenge:
 * Added New Class Challenge:
 * 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