Diablo 4's Secret Cow Level now leads to more than a novelty fight: in Season 15, Prime Ribs open the Bovine Sanctum and let you summon Moophisto. If you've already cleared the cow route, the next question is how many ribs to save and what the boss is actually worth. Keep your regular upgrade plans separate from this hunt; D4 Gold belongs to a different kind of preparation.How do you reach the...