Find the Throne of Destruction. Kill all the monsters in the throne room to activate the waves of minions. There are five waves consisting of <waves go here>. After all five waves of minions have been killed or led out of the throne room, Baal will laugh one more time and enter the portal behind him. Follow him and enter the Worldstone Chamber. Defeat Baal.
Reward
Quest drop. New Title. For normal and nightmare difficulty, access to the next difficulty.