Question: where is nihlathak at in diablo 2?
Answer: Nihlathak is found at one corner of the four-pointed Halls of Vaught level, the third Halls level below Nihlathak's Temple, reached through a red portal by Anya in Harrogath. Nihlathak is a quest monster, and only by killing him can you finish the Betrayal of Harrogath quest.