Henry thought about that for a long, heavy moment. "I think the first step would be to try to bait whoever or whatever this entity is into acting again. I can set up a sigil somewhere nearby or even simply set up some warding sigils somewh-" He cut himself off and pinched the bridge of his nose. "Which, of course won't be likely to work since this place doesn't seem to take kindly to anything resembling paint on the walls or an attempt to alter the decor too much." Something he'd learned very early on when he'd tried to change his room both with magic and with actual pigment.

The hotel was going to absolutely leave them defenseless against angels and demons both, wasn't it? The banishment sigil was worth a shot, but how they'd bait whatever was doing this into action was a little less clear. "Other wardings, other protections you can weave the magic into the fiber of a place, make it hidden. Sound. Heat. Cold. Things like that. Celestial and Demonic beings tend to be a little more direct about things. They can be made to be invisible to the human eye, but I don't know if whatever magic seems to run this place will be offended by that as well and remove it." He shook his head. "I'm sorry, I'm not very helpful at the moment."