yeah I like em too, and yes the ultimate skill morphed for health is awesome....Ive seen a guy use in one of his pts livestreams, and it deals decent aoe damage over 5 seconds and heals you for the amount of damage dealt to all targets
the animation looks similar to the vampire lord skill in skyrim dawnguard, the one in the perk tree where a swarm of bats surrounds you when combat starts
personally I will play my vampire with shadow cloak + feeding which will allow me to feed of a target in the middle of a fight if I manage to get behind the player....it heals full hp and unlike drain essence cannot be broken and doesnt take a skill slot, pretty awesome if you ask me