
Discovering that this wasn't true, and that she was merely a different version of the "Sacred" version of Loki - a version who was taken from her home and threatened with death solely because He Who Remains believed other timelines were a threat - is no doubt a devastating reveal. She also spends that entire time - which could be as much as 2000 years, given she confirms she's older than Loki - being hunted.

Sylvie was taken from her timeline as a young child, and was raised her entire life to believe she was defective as a result of being a variant. However, what little has been made clear about Sylvie's backstory explains this decision effectively. It is, however, also a decision that many may regard as a strange one, given that Sylvie knows killing He Who Remains could have a potentially catastrophic effect and create another multiverse war. Sylvie's decision to kill the Kang variant He Who Remains is perhaps the single most important event that takes place in Loki episode 6 - as it allows the iconic Marvel villain to replace him in the timeline, and results in the multiverse once again forming in the MCU. With new villains, new heroes, and an entire multiverse-changing event contained within it, it's safe to say that Loki's ending was anything but a boring conclusion to the Disney+ show. Loki season 1 masterfully navigates weaving major concepts like essentially introducing the multiverse alongside the personal growth of its main characters, resulting in an ending that is both satisfying and sets up an immense amount for the world of the MCU.

Related: Why Loki's Post-Credits Scene Is A Cooler Marvel Reference Than You Think Despite telling the protagonist duo that killing him will leave another of his variants in his place, Sylvie murders He Who Remains - a decision that, as the show's ending reveals, places Marvel villain Kang in charge of the TVA and thus the MCU timeline, seemingly. In Loki's ending, the answer to this puzzle is provided, as Loki and the Lady Loki variant Sylvie meet He Who Remains the creator of the TVA and crafter of the Sacred Timeline, who quickly explains that he made both in order to stop a multiverse wide war.
