Here is an excerpt from Book three: The Veiled Prophet:
"THERE IS NO NEED FOR THIS DEBATE TO CONTINUE ... 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.
It is not known who the angel in the image above is, but we do have clues that Diablo: The Sin War trilogy is canon lore that serves as ground for the development of the Diablo III Single Player. Angel Imperius is one of the five members of the Angiris Council in the High Heavens.
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