I'm a big mythology nerd, and I know that there are a lot of stories about angels. What sort of guidelines did you set for yourself when writing about them in Angelfall? Did you take liberties with any of the myths?
I wanted to add to the body of angel stories while staying consistent with the oldest, most respected ones. I took ancient stories of angels and embellished on those. Since so many of those myths are vague or inconsistent with each other, there was plenty of room for the imagination!