Power Plant

"Repair the broken robot with an Escape Pod's Fuel Array."

Power Plant is a challenge in Risk of Rain 2. This achievement is obtained by

carrying the Fuel Array from the Escape Pod to the Abyssal Depths Stage.

How to Unlock
REX is unlocked by completing the challenge "Power Plant". (Repair the broken robot with an Escape Pod's Fuel Array.)

The challenge requires the player to acquire the Fuel Array item at the back of the escape pod at the beginning of the game, and escort the equipment all the way to stage 4. Within stage 4, the player has to locate the disabled REX hybrid positioned at the high up platforms of the map. Interacting with REX with the equipment at hand completes the challenge, unlocking REX as a playable survivor in future runs.

Note: The Fuel Array occupies your equipment slot, but as long as you escort the equipment to stage 4, you can temporarily equip another equipment in prior stages to charge the teleporter and clear bosses without the Array's penalty.

Also, beware that the MUL-T survivor is unable to obtain the Fuel Array solo, as it deploys without an escape pod at the beginning of the run.