Koshin is the represenative for the "blue" side of Yogans religion, representing certain personalities or jobs. He is a calm, laid back tiefling. He uses his time to study the land, the religion, write books, and travels, bringing those from far away to join his religion. He is far more into the magic segment of his Warlock pact with Yogan, being more verse in the spells and cantrips he knows. When spending time with Yogan, they both speak mostly of academics and religion-based information.