Ruby.
I'm just being honest with you. How are you gonna get into a place sealed up like that, huh? Without making the others uncomfortable at the idea of there being a way for those other demons in even if it does seem secure? It'd still serve as a weaker link. It'd make the location penetrable.
We're definitely gonna need a kitchen in there though. A big one. Do you know where to buy those deep frying things that do the fries?