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That red portal will take you to the secret cow level and let you face off against the evil, hellish cow king. Just put Wirt’s Leg and the tome inside the cube and combine them, and a portal will open in Act I’s Rogue Encampment. You naturally get tomes and the Cube by playing through the game, so don’t worry about them.
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Afterward, you just need a tome of town portal and a Horadric Cube. Once you’ve done that, congrats - you’ve acquired the most complex ingredient of the entire recipe.
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You don’t have to keep coming back over and over to find it like the Black Mushroom or Gibbering Gemstone, but you do have to get it before leaving Tristram with Cain, or it won’t be there anymore when you come back. Make sure to take his peg leg off his corpse, which is in the top left corner of the map. When you go to rescue the ever-important NPC Deckard Cain from Tristram’s ruins, you can find the smuggler Wirt’s body. There’s only one rare item that you need: Wirt’s Leg. Unlike Whimsyshire in Diablo 3, getting to the secret cow level is pretty simple. But for anyone new to Diablo 2: Resurrected - or needing a refresher after two decades - how do you get your own one-way ticket to the secret cow level? Ingredients So, the developers decided to take a fun idea into their own hands, creating the secret cow level, AKA the Moo Moo Farm, in Diablo 2. Fan rumors about it circulated when the first game was released, but it didn’t exist… yet. One of the most beloved and infamous secrets of the entire Diablo franchise is the secret cow level.
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