Vullaby resembles a baby vulture. It has a plump, stout body, tiny wings, and stumpy feet. Its neck is short and supports a round head devoid of any feathers except for an enormous crest on the top. It seems to be wearing a broken skull as a diaper-like undergarment, hence its species name.
It has the tendency to use broken skeleton pieces, most likely skulls, as diaper-like clothing to protect its rump. It will chase after weaker creatures.