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I still don't understand this part. In Diablo II Diablo's soulstone is destroyed preventing his return forever but at the end of Diablo III we face him once again. How is this possible?

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Did you just not read or listen to, like, any of the dialog over the course of the whole game? – LessPop_MoreFizz Mar 16 '14 at 14:08
@lesspop to be fair the story/plot in d3 is bad to the point where it reaches parody levels. – l I Mar 16 '14 at 14:41
Well, sure. But there's a difference between a terrible plot you didn't even bother to read, and a terrible plot you've suffered through! – LessPop_MoreFizz Mar 16 '14 at 15:04
@AdamArold Well, if you haven't played, why are you asking? This information is easily found in-game, and on the internet. It kinda smacks of zero effort. – Frank Mar 16 '14 at 17:03
@Frank my only goal was to annoy you and it seems that I've succeeded. – Adam Arold Mar 16 '14 at 17:31
up vote 14 down vote accepted

This is all fairly well explained on various Wiki sites. The following is a quote from:

I marked the relevant section in bold; in essence, the creation of the black soulstone drew all the souls of the evils into the stone, together with the one of Diablo. Leah then frees the souls, turning her into the physical incantation of the prime evil.

Diablo spent two centuries slowly corrupting the Soulstone that imprisoned him. In time, he was able to extend his influence into the surrounding area and possess both King Leoric and his archbishop, Lazarus. The King proved too strong to fully possess, so the Lord of Terror took his son, Prince Albrecht. Diablo then began to shape an outpost of Hell within the catacombs that ran beneath the town of Tristram. By spreading terror into the surrounding countryside, the Demon was able to attract many heroes who came to cleanse the land of evil. By the time the strongest of these heroes, Aidan, reached this goal, though, he had become fully influenced by the power of Diablo. In his twisted state, Aidan believed that the only way to fully control the Demon was to plunge Diablo's Soulstone into his own head. This, of course, was exactly what Diablo had planned all along, as the Demon now had an even stronger body to use to find his brothers and complete his ultimate plan...

Diablo eventually possessed Aidan and went to free his two brothers, Mephisto and Baal. Diablo (as Aidan) met Adria the Witch, who knew immediately that Aidan was possessed by Diablo, and swore eternal servitude to Him. Eventually, a second party of adventurers confronted Diablo and killed him. This time however, his Soulstone was destroyed in the Hellforge, in an attempt to put an end to his evil permanently.

Unfortunately, the destruction of his Soulstone was not enough to end his evil. Upon the completion of the Black Soulstone by Zoltun Kulle, the souls of all the slain Evils are drawn to the Stone including Diablo (the location of souls after the slaying of the Evils is still unknown). Adria betrayed humanity by helping Diablo possess Leah, the vessel Adria bore 20 years before, the result of conception of Adria and Diablo. Now that all evils are in one body, Diablo is reincarnated as the Prime Evil and had begun his assault in the High Heavens. Unfortunately for him, Diablo was defeated by the Nephalem and cast down from Heaven.

While his brothers Baal and Mephisto prefer to play power-mongering games from the shadows through scores of minions, Diablo seems content to be the pure destructive power behind their machinations. This is not to say that Diablo lacks the intelligence of his brothers (as he rarely speaks), but being the youngest, he somewhat defers to their direction and suggestions in the course of their scheming.

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If they're combined, any idea why they call the "prime evil" Diablo, and not Mephisto or Baal? – Kevin Watt Sep 28 '15 at 23:23

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