I'm considering putting my speculation on the matter in a one-shot I MIGHT write. Although, I think my explanation is even more convoluted than anything else. I'm putting it down as a spoiler here, mostly because it will spoil part of my intended story. Tell me to take down the "spoiler" status if you think it's unnecessary.
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I believe somewhere in Riviera, it mentions there are multiple "fallen" angels that resided in Tetyth because they sought greed and power. I speculate that one of those angels managed to survive and Become THE Archangel in Riviera. It's possible that the power of the Archangel is either blessed upon any other Angel like the "Grim Angel" Status, or could be obtained through embracing the power of sin, which the one in Tetyh seemed to do. Because of this, it's possible Marietta and the one in Riviera might be Twin Sisters, sort of like Aegina and Luciana are . (See, I told you my take is convoluted.) In my story, 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.
This post has been edited by Ruby Eyes Yuan: Feb 21 2007, 07:04 AM
"I am well aware of the legacy the Grim Angels created, but it is not the kind of life I desire." - Yuan; Ruby and Crimson (A Riviera Fanfiction)