A picture based on the song The Moon Rises: [link] Just my take on Princess Luna's transformation into Nightmare Moon.Just to make it clear, her wings are not there. On purpose. For the transition from Princess Luna to Nightmare Moon, her once feathered wings vanish, which would then allow for the more bat like wings to sprout from her back. The beginning formation of the wing would be on her right side, which we cannot see. Or if you wanna look at it another way, then you could see the purple wind/wrap as becoming her wings. Either or. 8D