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Space and time distorted open, as the culprit behind Hel's monstrous power boost and her utter warmongering nature against all life on the World of Genesis appeared, the Ruler of the Necrotic Plane! The King of Death!
However, there was a little problem with him. While at the same time he stopped Hel from having her mind completely freed by Loki's attacks, possessed the entire Realm of Helheim, and battled Kireina's family, he couldn't battle these gods, as they all gathered within Flora's Supreme Nature Domain!
His powers could only extend where there was death and nether, but this third of the realm which Flora had covered on nature ended becoming a safe haven for them. Because of this, if he wanted to get rid of all the Supreme Gods at once, he had to simply manifest a part of his true body across a Nether Gate leading to the depths of the Necrotic Plane's Void, the deepest area of this Pseudo-Dimension, where his body rested.
Check "The Protagonist's Sister Is Actually the Strongest"!