Kahn looked at Ronin who not only met the conditions to utilize the Metamorphosis bloodline effect, but also become a High Lord.
A High Lord monster was comparable to a Peak Grandmaster Rank fighter. And since Kahn used 3 bodies of such assassins of this level & 2 of them had their cores intact, Ronin had no problems from going from Level 62 to Level 87.
And with Kahn unlocking Impartation skill with all the subordinates that had reached 100% Loyalty, Ronin now possessed all of Kahn's Assassin skills and abilities including his own merged abilities such as fear toxin, grappling extension, subterfuge, shadow strike, doppelganger and many others.
Ronin had now turned to a handsome human with similar height and built as Kahn. Just with long black hair and green eyes. There was a black mask ingrained in the left side of his face. As Kahn could remember, it was similar to the skull mask Ronin had when he was merged with Pethrall, the 12th-floor boss.
Reference Art for Ronin's human appearance given in chapter comments. Check it out.