
The clean answer first: in Diablo II: Resurrected – Reign of the Warlock, you do not need a Trophy of the Faithful to reach the Secret Cow Level. The access method is still the classic one: finish the game on the difficulty you want, grab Wirt’s Leg from Tristram, put it together with a Tome of Town Portal in the Horadric Cube, and transmute in the Rogue Encampment. If you have been seeing Trophy-based advice, that is almost certainly a mix-up with other portal recipes or newer Diablo secret hunts, not the Diablo II cow recipe.
This is one of those Access Guides where newer expansion chatter makes the old answer sound suspicious, even though the old answer is still the right one. Reign of the Warlock adds more endgame systems and more Cube convenience, but it does not replace the cow-level item recipe.
The biggest point players miss is that the unlock is difficulty-specific. Clearing Normal lets you open Normal cows. If you want Nightmare or Hell cows, you need to beat Baal on Nightmare or Hell first. There is no account-wide shortcut here.
Before you even think about the recipe, check the game difficulty on the character-selection side and make sure your character has actually finished that mode. A lot of “the recipe is broken” moments are just this: players beat Normal, jump into Nightmare, cube the items, and expect the portal to appear before Nightmare Baal is dead.
If you are helping friends in multiplayer, keep it simple: the character opening the portal should already have that difficulty completed. Once the red portal is up, the whole party can use it, but the opener is the part that matters.
This is where bad summaries really start wasting people’s time. In Diablo II: Resurrected, you do not buy Wirt’s Leg from a living Wirt. You go to Tristram and loot it from Wirt’s corpse. If you saw a guide talking about purchasing it for gold, that is not describing the Diablo II cow-level process correctly.

The practical route is straightforward: take the Stony Field waypoint, move to the Cairn Stones, and enter the red portal to Tristram. Once inside, find Wirt’s body and click it until Wirt’s Leg drops. Pick it up and return to town. You can do this again in later games whenever you need another leg, so do not worry about saving it forever.
If your inventory is packed with charms, make room before going in. That sounds minor, but it is the kind of tiny annoyance that slows repeated farming more than the actual combat does. The leg is easy to replace, but the inventory shuffle is where the process gets clumsy on console and controller layouts.
Now return to Act I and stand in the Rogue Encampment. Open your Cube through Inventory → Horadric Cube, place Wirt’s Leg and a Tome of Town Portal inside, then hit Transmute. A red portal to the Secret Cow Level should appear nearby.
The important detail here is the Town Portal component. The established Diablo II recipe uses a Tome of Town Portal, not a loose scroll. Some writeups muddle those two items, but if you want the standard cow-level recipe, use the tome. Akara sells one if you do not have a spare.

Also, do the recipe in the Rogue Encampment. That is the reliable, classic setup and the one most players still use. The portal stays open for that game session, so you can go in, take a town portal out, empty your inventory, and return. You will need to remake it in a new game, but you are not forced to do the whole run in one uninterrupted trip.
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Short version: for Diablo II: Resurrected – Reign of the Warlock, there is no verified cow-level recipe that uses Trophy of the Faithful. If you searched for “reach the Secret Cow Level with Trophy of the Faithful + Horadric Cube,” you are almost certainly looking at crossed wires between different Diablo secrets or separate endgame portal systems that also happen to involve the Cube.
That distinction matters because Reign of the Warlock does add more reasons to use the Horadric Cube. You may see new Item Recipes, rerolls, and portal-related materials discussed in expansion coverage. None of that changes the basic cow-level access recipe. For cows, the Cube is still just the delivery method for Wirt’s Leg + Tome of Town Portal.
The Cow King is still the named threat to watch for, but the old panic around him is lower in Resurrected than it used to be in classic Diablo II discussions. In modern Resurrected play, killing the Cow King does not carry the same permanent lockout fear that older players remember. That means you can farm the level much more freely instead of tiptoeing around the King’s pack every run.
Even so, do not treat him like a harmless trash mob. His pack can spike damage fast if you dive into the middle of it with poor positioning. If your build is fragile, clear the outer herd first, then collapse inward. The Cow Level punishes overconfidence more than it punishes low damage.

The reason people still care about the Secret Cow Level is density. It is excellent for rune hunting, socketable white bases, gems, charms, and any build that scales hard with tightly packed enemies. In Reign of the Warlock, that still makes cows relevant even with newer endgame options available.
If you are playing the new Warlock content, the useful part is not some hidden cow unlock interaction. The useful part is simply that an AoE-heavy build benefits from the same dense map layout cows have always offered. In other words, expansion synergies help you farm cows better, but they do not change how you open cows.
If you keep those five mistakes out of the loop, the whole process becomes routine: grab the leg, cube the tome, open the portal, clear, stash, repeat. That is why the Secret Cow Level remains one of the most dependable farming destinations in the game. The setup is simple once you strip away the bad modern shorthand.