Oh VERY cool.
I think the golem would be a great addition and probably a good seller, too - beyond its history, it’s a popular monster or character in tons and tons of fantasy games.
Other ideas, just spitballing:
The dead man’s hand: A corpse hand with candles melted onto the stiffened fingertips. Supposed to open any door. Morbid and creepy and very distinctive.
The basilisk: The legendary beast which either kills or turns to stone those at whom it looks (depending on specific legend). I’ve known others who wanted one but no one has made one. So far we’ve had to cobble them together from chicken and snake bits. Weasels are supposed to be immune to the basilisk stare (a funny bit of trivia). Ideally I’d like to see the rooster/snake version, NOT the Harry Potter snake with a punk hairdo.