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Hel had been utterly furious after the events that had transpired, Kireina's offense quickly shattered any hope she had to make her a temporal ally or something, as she began to quickly hate Kireina beyond belief.
She saw her as the ultimate enemy, if it wasn't for her stupidity, the Netherworld Plane Hegemonies, which she saw as her big rich daddies, wouldn't be so angry at her!
Hel had been planning to become their allies for eons now! Despite never becoming a Supreme, Hel had been in Genesis for a lot of time, since the Supreme Gods battled in the Ragnarök and even before that.
Born from Loki, the Great Trickster Goddess, she was a being that naturally harbored Death. Due to circumstances, she quickly grew older and quickly began developing more powers.
Check "The Protagonist's Sister Is Actually the Strongest"!