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Alucard was supposed to be a Dhampir, a half-human and half-vampire race. He had acquired this race through a series of special quests that rewarded him the blood of a noble vampire, which could turn him into such a race.
As for his class after the race conversion, it was called a Vampire Hunter. It was a special profession that originated from a famed tale.
But after he had accepted the inheritance of Dracula as well as the Vampire Primogenitor's Blessings, his race began to change. His Vampire's Blood became thicker and more potent, influencing his current race at that time.
He then became a special type of Dhampir, which possessed the abilities of a True Vampire Noble while being immune to the power of the Sun, specifically the sunlight, which could greatly weaken them.
As he had the Blessings of Dracula, the Vampire Primogenitor, his vampire abilities went beyond the understanding of common players.
