Umwak was a Dulok shaman from the Forest Moon of Endor. He served as the religious leader of the Dulok band ruled by King Gorneesh, and he sometimes had dealings with Murgoob, the Dulok oracle, and Morag, the Tulgah witch. Umwak had scraggly, green fur; long, droopy ears, and fangs extending from his lower jaw. He had yellow markings on his snout and belly and around his right eye. He wore no clothing, although he did sport jewelry such as an earring, a bone hairpiece, and a bone necklace. Umwak walked with a stooped gait, balancing on his skull-topped wooden staff. Umwak hated the Ewoks of Bright Tree Village, and he often hatched intricate schemes against them. He also had a nephew.