Slime King?

"System, I want to see this new Beast profile." 

[Affirmative!]

[Contracted Beast:

Name: Not set

Race: Unknown(Unnamed)/Slime King

Title: Unique One(Celestial)

Grade: Unique

Rank: D-Master Rank(Peak)

Skills: King's Disguise, King's Desire, King's Deceit, King's Clone, King's Deterrence, King's Engulf, King's Intelligence

]

Seeing the new Beast's profile, Ban was immediately tongue tied and was at loss of words. 

Starting from its race which was partly unknown and partly slime, he was already quite shocked. 

He also heard about slimes before. They were said to be one of the weakest creatures of this world that can easily be killed even by mortal kids. Those who awakened such monsters were even shunned upon by mere mortals, how much more Summoners who awakened strong monsters from the start.