So what happens when Aatrox finds out Azir is alive?
Just throwin' that out there. Is there going to be a second Shurima event where he re-Ascends to help Azir, Nasus, and the Targonians defend Runeterra against the Void when the second coming that's been hinted at occurs?
Maybe change his base skin to his Ascended form kinda how they changed Gangplank's base to his one-armed-with-a-stupid-hat look.
It'd make sense of why they were trapped instead of killed if they're needed to fight the second coming of the Void that the Aspect of Twilight would've known about.