 The Lord of Terror is back! Diablo has taken over the hero who managed to defeat him, and is on a quest to release his brothers, Mephisto, Lord of Hatred, and Baal, Lord of Destruction. You choose from seven heroes to go after Diablo and destroy him once and for all. Through the course of the game you are taken to the ruins of Tristram, destroyed by Diablo, to the deserts of Lut Gholein, and down into the bowels of Hell itself. Aided only by the last Horodrim, Deckard Kain, and a benevolent Acrchgangel, Tyrael, you must find and destroy Baal, Mephisto and Diablo s soul stones and lock them in the bowels of Hell forever. In the expansion, Baal, escapes to Mount Arreat, where the Worldstone, the Heart of the world is kept. He is trying to corrupt it for his own purposes, you have to stop him, and send him to hell with his brothers.