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'''Avatars''' are incarnations of the [[Eldar]] War God, [[Kaela Mensha Khaine]],{{Fn|5}} creatures of supernatural power only rivaled by the energies of the mightiest [[Daemon]]s.{{Fn|514}}

When a Craftworld prepares for a major war, its Exarchs begin to feel the Avatar's call{{Fn|1}} and should an [[Autarch]] call for war without the Avatar the naked ribs of wraithbone within the dormant avatar sound with a psychic roar heard throughout the craftworld. {{Fn|14}} The Exarchs, clad in ceremonial armour, go to the door leading into the Avatar's chamber. There they begin the ancient ritual to rouse the Avatar, where they anoint the Young King in bloody runes of [[Khaine]]{{Fn|13}} and sing battle hymns. The Young King is given the mantle of the Craftworld fastened with a golden pin, to identify to the Avatar of their allegiance, followed by filling a cup with the Young King's blood. Then the chamber's door opens and wielding ''Suin Daelle'', The [[Wailing Doom]], and the bloody '''Cup of Criel'''{{Fn|13}} in each hand the Young King waits outside the massive bronze doors of the throne room, watching as the door glows with heat and cracking flame, a [[Seer]] choir sings the "Hymn of Blood". The door opens and the assembled see the shadowed silhouette of the Avatar and as the Hymn reaches a crescendo the Young King steps forward and the doors close.{{Fn|13}}

The music and singing cease, all that is heard within is a thunderous rumbling. It may take hours or days, the Exarchs form a vigil but finally a terrible scream echoes from the chamber, loud and inhuman, and the Avatar rises: an explosion of hurricane force as the doors open{{Fn|13}} with a mighty roar.{{Fn|1314}} There is no sign of the Young King, aside from their screams - it is unknown whether the Young King is united with Khaine, or is destroyed{{Fn|3}}{{Fn|8}}{{Fn|11}} now no remnant but the blood which drips down the Avatar's hand and the [[Spirit Stone]]s which cover the avatar.{{Fn|13}}