Knull is an ancient malevolent deity whose existence predates the universe itself, and was originally content to drift through the endless abyss that existed before time began.
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History
When the Celestials began creating the universe, Knull was awakened by the "Light of the Creation" and outraged by his kingdom of darkness being despoiled. Knull retaliated by creating a sword of living darkness, the All-Black, from his newly-cast shadow, decapitating one of them. Cast back into the void by the other Celestials, Knull used the slain Celestial's severed head as a forge to temper his sword in its cosmic energies. Intent on devouring the divine light that had usurped his kingdom of darkness, Knull manifested a symbiotic suit of armor from the eldritch darkness he commanded and embarked on a genocide against the other gods, becoming a legendary figure of terror for divine beings even billions of years later.