Moknach

Moknach is a mythril ranked adventurer and the leader of Rainbow. Not much is known about Moknach on how he became a mythril ranked adventurer. He is a recognized adventurer in E-Rantel and looked up by others with respect and even worship.

As the leader of Rainbow, he was summoned along with his Mythril ranked adventurers peers from Kralgra, Sky Wolf, and Darkness to discuss the appearance of the powerful vampire Honyopenyoko. Momon insisted that the Darkness will fight against Honyopenyoko alone, arguing that involving others in the fight would simply increase the number of victims. Moknach and the leader of Sky Wolf accepted his opinion and did not participate.

(Source: Overlord Wikia)