Seraph Morgana !
Alternative names: High Council, Ascended or even...Arclight.
Potential appearances http://forum.r2games.com/attachment.php?attachmentid=106342&d=1411992664 http://i.imgur.com/LR3qMsC.png I removed the staff in the second pic because she looked like Janna, had no time to quality redraw the details.
Skill Animation
Q Swirly bright white light with a golden/white sparky trail. A succesful hit spawns horizontal light circles that serve as a cage.
W A boiling hellfire pit.
E White or golden barrier, a bit similar to Kayle's ult!
R Morgana flies as soon as you press R with creepy thin ghostly arms, or chains just fine, reaching out and grabbing the target. White or golden light swords come crashing on the targets from the sky on a succesful stun, similar to smite but a much higher perspective.
Judging by the animations, VO to fit the skin and new texture model, this skin would be around legendary level. I was inspired by The Solar-Lunar Diana-Leona reversal, so I wanted to see a similar thing for Morgana and Kayle!
Fallen Kayle http://upload.gtarcade.net/angel/2014/0828/173641171_1.jpg But covered with a dark, gloomy armor.