Great Growth

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After having evolved, I had acquired a wondrous thing, a Necrotic Death Core, this amazing jewel inside of my belly grants me the ability to wield the mysterious and completely not-so-unique Necrotic Energy!

Think of it as some sort of special energy of pure death, even purer than Death-Attribute divine energy or mana, this pure death essence is not born naturally, but it originates from the Netherworld Plane, a special dimension of its own.

I had already been explained by Mammon and his Plutus friend that the Netherworld Plane and other Planes are "Rogue Dimensions" that move around space and time, invading other Universes and stuff, so as they are dimensions of their own, their rules and other things are unique compared to the outside Universe.