secretly the darknight hero. Diluc is the older brother of Kaeya however after the death of there father he refuses to acknowledge kaeya due to Keaya being the ancestor of the Abyss order's founder and from Khaenri'ah When Keaya was adopted by Dilucs father as a kid, diluc and kaeya became very close brothers. He cares for Kaeya secretly. Diluc hates the knights of favonius. Diluc has a pyro vision and kaeya has a cryo vision.