Imperius is originally the bravest and most powerful person in the High Heaven. Imperius's weapon, the Solarion Spear, is also the most powerful weapon in Heaven. From strength to weapons, he is stronger than Tyrael. But Imperius has an extremely arrogant character and follows heaven's dogma too strictly, to the point where he despises all non-angel races, including humans. Tyrael is the archangel of justice in the minds of players.

In the battle in front of the top of Heaven, Imperius was originally going to kill Tyrael, but Diavolo had already begun to destroy the Crystal Dome, which made Imperius and others All angels lost their power. Tyrael, on the other hand, had been forced to give up his wings and fall into the mortal world in an earlier conflict, and he was not affected by this. So Imperius failed to defeat Tyrael.