ALL Skull-Brethren, take heed: DO NOT attack or banish the ghost!
Yeah, she's creepy and looks gross and might wake you up in the middle of the night with that off-key singing (if you can call it that), but deal with it. The Guard is absolutely horrified of her. The "wet yourself, drop your sword, and run away from your post" kind of horrified. She's our best friend for keeping the Guard out of the Refuge.
If I catch you messing with the ghost, you're gonna end up like Ol' Limpy.