It is said that after the birth of the Chaos God Slaanesh during the Fall of the Eldar in the 29th Millennium, she fought and killed the Eldar Gods one-by-one. But the God of Blood, Violence and Death, Kaela Mensha Khaine, was too strong to be destroyed forever. So Khaine found refuge in the Infinity Circuit of the Eldar Craftworlds, and the fragments of his spirit can be summoned in times of great danger by the Eldar to inhabit a physical body that will fight on their behalf. These are the Avatars, a single fragment of a true Eldar God. The Eldar call forth the Avatar in times of dire need by sacrificing an Exarch to Kaela Mensha Khaine on the eve of battle. The Avatar becomes a fiery, animated manifestation of the God and leads the Eldar armies into battle.
Imperium of Man
While only the Eldar have actually made use of physical Avatars to date, the Thorian faction of the Inquisition searches for the Avatar of the Emperor of Mankind who they believe actually will be born somewhere and at the time of the greatest need for the human race among the teeming billions of the Imperium of Man. There are numerous factions within the Adeptus Mechanicus, including the Khamrians, who pursue the forbidden science of artificial, or "abominable" intelligence. The Omnissiads of the Cult Mechanicus seek to summon the Machine God into an Avatar called the Omnissiah. In the early days of the Great Crusade, the Emperor of Mankind was recognized as the Omnissiah by the leaders of the Adeptus Mechanicus, prompting the Treaty of Mars and the alliance of the Cult Mechanicus with the nascent Imperium of Man.
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