I'm very new to the hunter scene, but as that fella before me said, they look great when every tom dick and harry has a Bloody cat and a crab comes striding out from the distance....being bloody enormous =). Personally i reckon the crab special ability (if it were to ever get one) would be a sunder armour style one, maybe not stackeable but just something to give crabs a real flavour to them (other than seafood sauce (mixed with all the crap we feed em)).