Travel down the coast and start the "Infiltration" quest. Find the man with a catapult. Ride the catapult into Twistram, then travel up the hill to Twistram Cathedral and enter. Headbutt the altar to move it out of the way. Follow the secret passage that is revealed to enter the church basement. Enter the swirling purple portal at the end of the hall to teleport to the "Not So Secret Cow Farm", where laser eye cows are walking on two legs. You can also find the Cow King in this area. The cow level and the reference to "Tristram" are both related to the Diablo series.