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CONTAINS SPOILERS
Chapter 8: Reunions / Reach The Dome of Geist
Eventually you'll encounter a corrupted room with a Mycelium bulb needed to free the elevator. 1. Use the explosive in the room behind you to free the platform from gunk. 2. Shoot the explosive from the ceiling onto the platform as it moves to remove the rest of the gunk. 3. Grab the bulb and plant it in the room across the elevator. Go up and clean the gunk to ride the lift.