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This Vampire guy was seriously a sicko. I mean, I would have probably done the same in his place but maybe not as insane? I get it that he needed blood, but god lord calms down…
He was the one that brought Vampires into this world whose concept of Vampires didn't exist before. He had also brought a new Attribute in the Blood Attribute, which his Mana Core was.
He had used the power of his Unique Skill to devour the life essence of the living beings of this world while also drinking their blood for nourishment, through this method, this old bastard managed to turn the order of the world upside down, it was said that the population of people had been reduced to almost 70% due to his massacres.
However, in the end, Fate never loses… he was defeated by the lifespan, and he died.
Check "The Protagnist's Sister Is Actually the Strongest"!