[@Tyro]

I'm still a little sketchy on her history. I was thinking that possibly that Michael could be her old flame turned demon? Not sure yet but that could lead to a standoff between her and Michael at the end that maybe Merlin or Arturia would have to finish because she might have trouble killing him since she loves him...Thoughts? Not sure where you want to go and I don't want to trample your ideas.

I'm leaving the setting more to you because I think you have an idea of the direction you are wanting to go and where she comes from isn't going to be modern. PM if you get on so we can talk.