Guild Wars 2

Every other type of Risen has a very obvious origin (i.e. chickens, bulls, gorillas). Even things like the Eyes visually make sense once you know from the story what their source was.

So, where do the claws come from? Are they just an amalgamation of corpses, or was there some specific creature that there were a part of?

They strangely are reminiscent of Torment Claws from Nightfall. I don’t know exactly, more than likely a amalgamation, much like the bone ships.