So in order to look more like the art, I'm considering scratch building my own wings for Terminus, or buying a set and cutting out a lot of the inner material so that they look more tattered.
Here are some of the ones that I've found. Right now I'm leaning towards right now.
GW Winged Nightmare Wings
GW Dragon Wings (which are also similar to this set of "Demon Prince Wings" from Bitz Barn)
Or this set of GW Bloodthirster Wings