@Rune_AlchemistI believe that should be perfectly fine. Being attuned to illusion magic would make your character a rare case among the Aetheri which might help your idea of being a black sheep.
@GlyphYou pretty much hit the nail on the head regarding their architecure and clothing style. Also, it is funny that you should choose Amaranthine as your city because it is home to one of the most powerful vampires in the world named Catherine St.Claire and her two sisters.
@BishopThat idea fits very nicely within the lore for Caraxis. Their technology level is around pre-industrial era with some bits of steampunk tech gained from the Dwarves. There are certain magical materials that feed off of magic. One such device is a collar that drains all magic power from the user. Another is a shield using a refined alloy mixed with a crystal that blocks magical attacks.
I might give the islands around the main continent some more information once I set up the full RP. The Leviathan Islands and Shattered lands are mostly unexplored places with either tribal races or savage monsters.
@CloseEnoughClassic rules?
In any case, that is fine with me as long as they have a reason to go to the Sanctuary. The occupation or role you had outside of the Sanctuary can be completely up to you as long as it doesn't break the current lore or is too powerful.