An Avatar is the spirit of a god in a material form.
It is told that after the birth of the Chaos God Shaanesh, 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 Slaanesh broke Khaine up into a myriad of seperate parts and scattered them throughout the galaxy. These are the Avatars, a single fragment of a 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, including the blood dripping from his hand, and leads the Eldar army into battle.
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 Omnissiah, prompting the Treaty of Mars and the alliance of the Cult with the burgeoning Imperium of Man.
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