The hero from the first game, after containing Diablo's spirit and journeying to the east, succumbed to the powerful will of the Lord of Terror. Now Diablo is free from his entrapment below Tristram and has assumed his original appearance, but with much greater power. As the game begins, he is somewhere in the East, raising an army to conquer the world. The action in Diablo II proceeds through four acts, with each act comprising a town and its accompanying dungeons. Each act will also tell a little more about Diablo's origins and plans, which include freeing his evil brothers Baal (the Lord of Destruction), and Mephisto (the Lord of Hatred). Together, they form the evil triumvirate known as the Prime Evils. As the game's hero you will have to track Diablo through each act and town and try to prevent him from raising his evil army. Your hero comes into the game as a powerful and experienced adventurer who has heard of the Lord of Terror's renewed rampage, and has set out to stop him. Your journey begins in the mountains at the Sisters of the Sightless Eye monastery, where the Lesser Evil Andarial has seized control. You may remember the rogue character from the original Diablo was a part of the Sisters order. Andariel, a demon from hell, is hoping to get on Diablo's good side by conscripting the rouges into her evil army. Andariel soon corrupts all the captured rouges, but a small band of survivors forms around the monastery, creating a makeshift camp and Diablo II's first town. You need to uncover Andariel's hand in the fall of the monastery and free the Sisters. Once you defeat Andariel in the town's final level, you'll move on to subsequent acts and locales in the East.