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it mentions there are multiple "fallen" angels that resided in Tetyth because they sought greed and power.
It didn't say why the Angels of Tetyth were expelled, but they are the founders of Tetyth. All those statues that the girls accuse Ein of feeling up are of them.
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I speculate that one of those angels managed to survive and Become THE Archangel in Riviera.
You can't become an Archangel if you're a Fallen Angel.
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Marietta's Twin Sister slays her "Good" counterpart out of jealousy for her rank, is condemned along with the rest of the Angels, and obtains "Archangel" Status by embracing her personal sin of murder.
... Even if that weren't insane, that wouldn't explain how she became a (potentially metaphorical) child of Hades with the ability to spawn demons.
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The war rages on, with no side seeing victory nearby in the future.
Actually, it says the God's created the Grim Angels out of fear of losing. A last ditch effort.
After a rather thoughtful entrance, your argument descends in to drivel however, especially since you forget the important fact that the Magi were instated following the death of the Gods, to rule in their stead; Hades did not CHOOSE Parveeju as his home, he was imprisoned there; and that's not how it could have worked with Marietta since the Riviera Archangel was banished from Asgard.
Also, you all seem to forget that demons and humans are the same thing in (at least) the Riviera universe.
Писатель всегда будет в оппозиции к политике, пока сама политика будет в оппозиции к культуре.