So Darkin are weapons who possess their hosts, that's a thing now. And since we learned that I've been thinking.
Rhaast didn't give Kayn wings. Varus doesn't have wings. Yet Aatrox does.
Conclusion: 
may be closer than we thought to 
and 
I know this is farfetched but it's also possible.
#AngelAatroxSociety2017
No thanks to that idea.
I dunno. I kinda like that idea. Kayle & Morgana need an update so it's possible.
It really does put into question who/what was Aatrox.
Or maybe Aatrox just has wings cause his fucking badass.
that makes no sense.....
Who says all Darkin are the same? They don't all need wings.
Aangeltrox
Eh there could be many reasons why he has wings and the others don't saying he is related to Morgan's and kayle in any way has the same probability of aatrox being vastayan before he was a host to the darkin. I see the darkins closer to a parasite now and they adapt to their hosts AND their surroundings I'd like to think. It's possible he is some kind of angel but I doubt it will ever be true or confirmed.
Morgana and Kayle are in serious need of a lore update of some kind. Their entire existence is predicated on a League that no longer exists in the setting.
Star guardian Aatrox
Very boring and lazy idea. No need to ruin two characters via association with the very lackluster darkins.
Well aatroxs wings are more like banners growing out of his back anyway,they aren't even real wings.
