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The page was not linked from the main page and was not promoted via their twitter or facebook feeds for several days after it went live, leaving fans and media free to speculate and publicize it virally.

As seen during Act 4 of Diablo 3, Imperius fought Diablo as the Prime Evil and was defeated and badly wounded, but not killed. After that setback Imperius led the angels in unsuccessful defending the High Heavens against the forces of the Burning Hells, and was overtly hostile to the [[Nephalem]] hero (your character), seeming on the verge of attacking before falling unconscious once Diablo reached the summit of the Silver Spire.

While the other Archangels are seen in the epilogue after the hero defeats Diablo the Prime Evil, nothing is known of Imperius' disposition, but from his behavior during Act 4 it doesn't seem likely that he's happy. The above quotation from the Book of Cain surely refers to Imperius with the line, "Valor shall turn to Wrath" and many fans are speculating that he will not rejoin the Heavens but will instead become an enemy of humanity, or perhaps even a corrupted monster, like [[Izual]] before him.