My guess was going to be a hulking, bizarrely-dressed manifestation of our guilt and sins, but water zombies sounds like a fair enough guess too.

[He is fully expecting to get jumped by something in an elevator shaft, yes. Which... maybe that's one? He slows down as he reaches a point with no lights on. It makes sense: why would there be lights in an elevator shaft? Dirk stops at the edge to peer in.

Darkness downwards, darkness upwards.]

I'm down to a Fancy Santa, so it's up to you if you wanna take this or try to find some stairs. [He isn't sure if this will have stairs, but it probably does have structural collapse somewhere. They'd find a way up eventually.]