→Act IV - The Pandemonium Fortress
*Seek Diablo in his sanctuary and vanquish him from the mortal realm.
[[Izual]] at one point was one of Tyrael's most celebrated lieutenants. Untill, going against the wishes of the [[Angirus Council]], he led an ill-fated assault upon the Hellforge. Attempting to stop the creation of Shadowfang, an evil weapon being created to combat the Azurewrath, the blade carried by Izual himself. During the assault, he was captured and tortured for information. He gave in and spilled secrets of The Heavens to the armies of Hell. Upon his return from the pits of Hell, the [[Angirus Council]], angered by his disobedience and engraged by his betrayal, punished him by locking his form within a demon from the abyss and banished him to [[The Void]]. Tyrael gives this quest, and asks that Izual be put out of his misery. Originally he then appears to be a miserable character, but upon his death, Izual tells the band of adventurers that he told the Prime Evils how to corrupt the soulstones and so helped them ''"mastermind their own exile"'' into Sanctuary. In truth then, Izual appears to have played a crucial part in the plot, and without him it is unlikely the Dark Exile would ever have taken place.
After having slain Izual and shattered Mephisto's Soulstone, the heroes move towards Diablo. The [[Lord of Terror]] fortifies himself in the [[Chaos Sanctuary]]. Its architecture is towering and gothic, but its purpose is unknown. The band of heroes defeat Diablo and his soulstone is smashed at the Hellforge.
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