Need help selecting a back attachment

Heya! Here is my character.

He feels incomplete without a really cool back attachment.
What do you think will best suit this outfit?

I am thinking of the Sin wings, but are they black enough? They seem to be quite a lighter gray. Can anyone confirm this? Or if you have them, invite me to your hideout so I can see them?

PICS:
BACK: https://imgur.com/fH6AJ21
FRONT: https://imgur.com/oTDopRY

Sometimes a look can feel incomplete only because you have an expectation of seeing a back attachment. It doesn't necessarily need one.

You should do the older gore raven wings, not sure if that's exactly what they are called.

I didn't pick up the new demon raven wings, but I wouldn't - they won't match the armor set as well because the wings have some pink fleshy elements the preview video attempts to hide.