Betrayal of Harrogath is the fourth quest of Act V. After players rescue Anya from her icy prison, Anya tells them the last remaining elder of Harrogath, Nihlathak, has willingly sided with Baal in exchange for the demon's mercy. Nihlathak even provided Baal with the Relic of the Ancients, allowing him to enter Worldstone Keep unhindered by The Ancients. Anya then tasks the player with slaying Nihlathak and opens a portal to his hiding place, Nihlathak's Temple.