"The Essence Blood Contract is the highest-spec contract a Giant Dragon can use with its followers, rarely utilized by either Five-Colored Dragons or Metal Dragons."
Udi, too, has so far used either ordinary contracts or the least effective bloodline aura soak for all his followers, because he feels that his current followers aren't worthy of his precious essence blood.
A Servant Contract cannot entail a contract with a Giant Dragon, as their bloodlines share the same origin, making it impossible to perform bloodline soaking. However, as Diya Harut is an Abyssal Dragon, his bloodline is not of the same origin as Udi's, so theoretically, as long as Udi's bloodline and strength are sufficiently powerful, he can establish a servant contract with him.
In this matter, Udi is confident.
Although he is a Black Dragon now, after so many Banquets over the years, the bloodline of the Black Dragon has long been inextricably intertwined with the Void bloodline, undergoing profound mutations.
