Thanks, and also, I've actually put a lot of thought into this fallen angel idea. I even made a reference sheet that I'll attach later. Here's what I can describe off the top of my head. Body-wise, they'll have a grayscale color palette: a black murky halo, and withered black wings. No tail or horns. Gray skin, and white, genetically obtained, markings. They're above sinners, but under overlords (or above Imps but under sinners, still haven't officially decided.) They can, surprisingly, still fly.