Investigate 'The Lurker'
Cognitiohazard for all the late night ponies
A creature of indeterminate origin has appeared when the hotel goes into lockdown. Looking at it poisons the mind when perceiving it, especially if some or all of it’s covering garb comes off or up, and trying to think of a cognition of it can cause mental damage.
Leaving it alone might turn out to be dangerous and cause further problems, so you need to figure out what you’re going to do about it.