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Easter Egg: Secret Cow Level
It's possible that no Easter Egg has been discussed as much as Diablo II's cow level. It's almost required to try it out when you play. If you've beaten the final boss (if you have the expansion installed, you have to defeat both Diablo and Baal), all you need to do to get there is go to the rogue encampment. Once you're there, combine Wirts Leg and a Tome of Town Portal in the Horadric Cube. A red portal will appear. Step through, and you can get right to the bovine slaughter. It's important to note that once you kill the Cow King, you won't be able to re-enter the Cow Level on that difficulty.