History
He Who Remains was the only survivor of the Multiversal War between different counterparts of himself. He established the Time Variance Authority to prevent any future variants of himself by pruning all branching timeline deviations, no matter how minor. He Who Remains resided in the Citadel at the End of Time, a castle carved out of a solid asteroid that was located outside the timestream of the "Sacred Timeline". Near to the end of his near-infinite knowledge, he was visited by two Variants of the same person: Loki Laufeyson and Sylvie Laufeydottir. He explained to them their choice: to take over the TVA and continue his mission in a more benevolent way or kill him and let the branching timeline plunge the Multiverse into a new chaos. Sylvie was determined in her quest and after sending Loki away, killed He Who Remains by stabbing him through his chest.[1]