Avia was Izaya/Highfather's loyal wife, whom he loved deeply. Being a
warrior king, he needed a woman to keep him in touch with his soul and away from
the battle: Avia was that person. But that ended when Steppenwolf led a raid on
New Genesis to kill Izaya. As he was about to do so, Avia threw herself before
Steppenwolf and was killed in Izaya's place. This led Izaya to kill Steppenwolf
and foil the raid. But his wife was dead, and Izaya would never be the same.