None (Altfire drains health)Altfire:
TheDoomedArchvile, Blue ShadowSounds:
Weak melee health drainer with damaging alternate attack
Oh god, what in the hell is that thing!? It's dug into your arm and won't come off now. This is so gross, but at least it appears to be useful. Raise it up to an enemy and have it suck the blood of your victims to heal yourself for a small amount at a time. Or, you could have it drain your body parts and spit them out as projectiles... Eww.