Thousands of years later, after the Conflict is brought to a 'grinding halt' with Sanctuary's creation and the Worldstone is destroyed by Tyrael, Malthael disappears and abandons Heaven, leaving the Council broken. Together, the Council manages to quickly overwhelm and constrain Diablo, and despite both Auriel and Tyrael expressing their desire to imprison the demon and thus turn the Eternal Conflict in Heaven's favor (as Terror itself can never truly die), Imperius brashly overrides them and savagely slays Diablo regardless, sealing his triumph in blood, but in turn undermining and weakening the very unity that had been the Council's greatest strength. Imperius commands the Heavenly Host to pursue the demonic hordes as they retreat, and, instead of stopping to regroup the angels as Tyrael seeks and advises, presses onward alone to confront Diablo himself in his unholy lair, where the Lord of Terror has already slain many of those whom Imperius had sent forth.ДЄfter a short but fierce struggle, despite holding his own and managing to wound Diablo, Imperius is incapacitated, freed only by the timely intervention of the rest of the Angiris Council. In Diablo III: Wrath, Imperius is the last member of the Angiris Council to attack Hell's demons, easily slaying a massive, grotesque one-eyed fiend after it brutally kills one of the angels under his command. In the Opening Cinematic, he is the first Angel to strike the hordes of the Burning Hells, and demonstrates deadly power and skill in combat with them, wielding Solarion to break through their infernal forces. Unable to prove himself, Imperius has apparently become obstinate on the council and somewhat of a tyrant. When Tyrael developed sympathy for humanity and brokered the truce between Heaven and Hell however, he effectively robbed Imperius of his very purpose. HOW WILL YOU CHOOSE, YOU WHO HAVE SEEN THEM AT THEIR MOST FOUL? WILL YOU VOTE WITH ME AND PUT AN END TO THIS MOST HEINOUS OF SPAWNING GROUNDS?' Relationship with TyraelД«efore the Sin War ended, Imperius seems to have had a good relationship with Tyrael, both great warriors and fervent enemies of Hell wherever its presence might appear. Before he knew Tyrael's stance on humanity he did call him friend:

He doesn't always see eye to eye with Tyrael, particularly when it comes to Sanctuary and humanity, yet though there doesn't appear to be outright hostility between the two. WHAT HAS BEEN WROUGHT BY THE TRAITOR MUST BE UNDONE! LET THE HOST FINISH WHAT IT BEGAN, EVEN IF WE MUST CUT THROUGH A HUNDRED RANKS OF DEMONS TO ACCOMPLISH IT!' OR TO HAVE EVEN BEGUN, declared a majestic angel with robes of royal red and a shining breastplate upon which the image of an upturned sword blazed. 'THERE IS NO NEED FOR THIS DEBATE TO CONTINUEвЂ¦. He has killed billions of them over the course of his existence, and so because of their demonic heritage he was the most outspoken member of the Angiris Council against allowing humans to live: In success it is he who most daringly exploits hell's weaknesses, and in retreat he is the rallying cry of the armies of Heaven. Imperius is the warrior of the Angiris Council and the commander of the Heavenly Host.

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