Prayer experience. Bury it, use it on a Player Owned House altar (more XP per bone), or grind it for worshipping the ectofuntus.
Notes:
140 prayer experience for burying. Varied experience for using on POH altar, depending on which altar it is (gilded altar with burners lit gives 490 XP). Ectofunctus gives 560 XP but is a much slower method than altars.