[[Image:Mon-baal-names.jpg|thumb|200px|left|Baal above the Vile Effigy.]]Baal is the last monster in the game, and the act boss of [[Act Five]]. He must be defeated to complete the [[Quests_Act_Five#Quest_Six:_Eve_of_Destruction|Eve of Destruction quest]]. Killing Baal enables a character to proceed to the next higher difficulty level, and gains that character a title as well. Killing Baal is also required before a (D2:LoD) character can open the portal to the [[Secret Cow Level]] on that difficulty level.