An Ifugao god of war, a "blood drinker," as well as a god of the moon, justice, and oaths. Umbulan is also a god of divination, using the agba stick to determine the cause of disease, to find lost property and to detect thieves.
- Barton, Roy Franklin. (1946). "The Religion of the Ifugaos." MAAA no. 65, pp. 38-39, 91.