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Hel was resting over her throne of bones. She was tired. Just recently she had begun to refine her Necrotic Core, a new power from the Netherworld Plane given to her by the Necrotic Death Lords.
This power brought her the amazing abilities of wielding the Necrotic Energy and mix it with Divine Energy something completely unique that nobody else in the Universe, both Universes, could had ever been able to do.
By using the Necrotic Energy, she would be able to wield the power of the Netherworld Plane, such as the Necrotic Arts, Necromancy Techniques, and many other things they were able to do.
She had already been gifted the Daos of Necromancy and Undead by the Hegemonies of the Netherworld Plane, these powerful entities beyond Supreme-God-Level were investing into her because they knew she could bring them what they wanted, ways to conquer an entire universe.
Check "The Protagonist's Sister Is Actually the Strongest"!