Bosses
Moophisto
Cow world boss in the Bovine Sanctum, summoned with Prime Rib.
Where and how
Moophisto, the Divine Bovine, is fought in the Bovine Sanctum. First get Prime Rib from the Cow King in the Secret Cow Level. Then use the Altar of the Heifer, east of the Tyrael's Encampment waypoint in Skovos, to reach the sanctum. Five Prime Rib at the altar inside summon him.