Imperius, Archangel of Valor, is an archangel of the High Heavens and the de facto ruler of the Angiris Council. He has led the Heavenly Host to numerous victories over the forces of Hell, but his pride and rashness has often caused recklessness that would ultimately cost him.

You're a Crusader, a Nephalem, who met Imperius during Hell's assault to the High Heavens.

After you managed to defeat Diablo and his minions, securing Heaven's balance once again and restoring the Crystal arch, you finally have the time to interact with the archangel of Valor; to convince him that your intentions are as honorable as his. However, Imperius is quite loyal to his assumptions and beliefs regarding mortals, finding them abhorrent, as mere mistakes in the creation.