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Noah was not the only one that reincarnated in the world of Abyss. Back on his original world, Earth, he once used to be but a normal human, a talentless boy that thought he had no power, until the moment he absorbed the Core of the Vampire Progenitor, a powerful S Rank Monster from one of the many Dungeons that have invaded his planet.
With the arrival of Dungeons in Earth, Hunters, people with awakened, supernatural powers emerged, obtaining power from absorbing Cores from Monsters, such as Skills or even increasing their own Stats thanks to the help of the System the core of Earth had created.
His life started dozens of years after the apocalypse that happened on Earth, after absorbing the Core of the Vampire Progenitor, an ancient Vampire that lived in Abyss and ended becoming a Dungeon Boss, he inherited his powers and became the first Vampire of Earth.