To get the Royal Calf, follow the steps below to get Wirt's Leg during the Darkening of Tristram event. You need to be in Adventure Mode and head to Old Tristram, then South to the portal, which takes you to the Darkening of Tristram event. How To Get Wirt's Leg in Diablo 3 Darkening of Tristram Find the Black Mushroom on Level 9 and interact with it to get the Rotten Mushroom. Since 2017, it has run each year from 1st to 31st January, celebrating the original Diablo in glorious RetroVision. The Royal Calf can only be acquired during the Darkening of Tristram event in Diablo 3. Who knows what they would do if he went missing. This young creature has a regal air, as though he holds some special place within his herd. A lore description of this awesome cow pet reads:

Once equipt, it will pick up gold for your character. The Royal Calf in Diablo 3 is a pet that you can equip.

Update on : You will have to wait until the next Darkening of Tristram event to get the Royal Calf cow pet in Diablo 3.

Pets diablo 3