The Name's Dio

Every king of a species will automatically have the Skill, Deterrence to them. Eva was only a Queen candidate for now but even she already carried some traces of the Skill 'Deterrence' in her.

As for this new monster that Ban had summoned, it already has a solid Deterrence to it. This only meant that the monster he just summoned was already a king or a queen of a species. 

Kuys came from the empire's capital. He has knowledge that someone like Yakob who claimed to have traveled the whole continent could not afford to have. 

Hence, the moment the new monster was summoned, he knew at a glance that it was already a King of a Species. 

After the King's Deterrence's effect unknowingly calmed down, the slime king suddenly shifted its body towards Kuys. Seeing that Kuys was strong, it shamelessly turned its body around, acting as if nothing had happened.

"Err! This Monster is called the Slime King, and is already at the D-Master Rank,"