Potentially important but not sure imperious is the only arch angel to wear a helm not a hood, hiding his horns maybe :)
Imperius kinda struck me as the "over-zealous but thinks he's doing God's work" type of character. I'm not so sure he has potential to become a villain.
Also, do we even know if he still lives? Last time we saw him he got his !@# floored when Diablo started putting out the light or whatever in the Silver Spire.
Then during the battle with big D he does his whole "this wretched light must be eradicated" thingy--what was that? Did that mean he put out the light after all? in which case, Imperius should be dead, right? Along with all other angels, at least those in the blast radius.
However what I'd like to have in the expansion is revenge on Adria.
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