I must confess, when first reading the name, I originally imagined a construct made of bone (and pictured the bone artwork of the Capuchin monks in Rome). I'm glad that the idea was something more original. The Ossuary Golem follows the long tradition of taking two things and smushing them together to make a new monster. I imagine a hulking creature with a stone casket for a torso, containing a vampire waiting to go "peek-a-boo."