If he succeeds in controlling the stone, the gates of hell will be opened and the heavens as well as the earth will be doomed.
He is in search of the mythical Worldstone, which created and balances the heavenly, demonic and human kingdoms. Mephisto and Diablo are destroyed, but the last great evil, Baal, has escaped to the barbaric lands in the north.
The city’s most important NPCs are the alchemist Malah, the blacksmith Larzuk, the barbarian warlord Qual-Kehk, the wise man Nihlathak, the orphan Anya, who also offers gambling among other things, and the ever-present Deckard Cain. Like the camp of the hunters in the first act, Harrogath serves as a base for action and quests throughout the rest of the game. First talk to Deckard Cain and Tyrael, who then opens a portal to Harrogath in the Lord of Destruction expansion. At the beginning of the 5th act of Diablo 2 you start in the Fortress of Madness in the 4th act of the main game.