Yin!
When he heard that name, Marvin finally understood why this person seemed so familiar!
The highest of the Blood Primogenitors!
Back when he was active, there would often be powerful Legends that fell unexpectedly. Although there was no proof, many people attributed those incidents to this Vampire Primogenitor.
He was far too powerful.
It was said that he once fought the Sovereign of the Elemental Plane of Fire and managed to come out unscathed!
The Four Elemental Sovereigns were the most important parts stabilizing the Universe!
Their strength was enough to overwhelmingly crush most High Gods. In the entire Universe, there wouldn't be more than ten people that could exceed the strength of the Sovereigns!
Although Yin couldn't defeat the Fire Sovereign, it was already a feat to survive his fury.
But it was because of that battle that Yin fell into a long slumber.