My high level group is currently embarking on a mission to assassinate the arch devil, Geryon. They are making their way through Coldsteel castle and dealing with his minions, most of whom are ice devils. As they clear out their lairs I'm having a bit of trouble imagining what sort of things they the PC's might find in them. I assume they might come across larval souls (hellish currency), and perhaps the odd tortured corpse, but what kinds of mundane things can I stock their chambers with that will make the environments seem more real? Any ideas would be much appreciated.