In my limited runs, I've seen:

Mining Operation
Miner's Mallet of the Dead
Orlok's Miner's Mallet

Castle - Crypt
Vampyr Chiroptera Crossbow

Castle - First Floor
Lilith's Chiroptera Staff
Lilith's Chiroptera Wand
Sanguine Chiroptera Longbow

Castle - Second Floor
Chiroptera Cowl of the Fang
Lilith's Chroptera Staff
Orlok's Chiroptera Claymore

Castle - Third Floor
Chiroptera Sword of the Dead