I'm clearing Anor Londo with a lvl 20 Balder Knight character and had ran past the past two elecro-demons and up on the ledge where I reloaded to make sure the demons de-aggro. When I loaded back in this happend :O I've only seen those crab thingies once before in the kiln of the first flame, I thought that was the only place they could spawn at. Can anyone tell me what they are called and if they drop something valuable? :3.