Goronglix sends another mental message:
I've got my own business in the vault. Don't worry, I can control the elevators from there. And I'll try to activate the rails!
They drop from the top of the elevator and ooze to the east, headed for the small room that houses the vault. They take an opportunity attack but don't slow down, ducking through the door and extending a pseudopod to the controls beside the door to lock it behind them.
Cocytus follows the rest of the group, barreling to the west, and positions himself in a narrow gap between a cart of materials and the roaring vent. He raises the orc's over-sized sword and bellows something.
Spoiler: Perception 12+
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"I'll hold them off! Get to that brain!"