Eajey Daven Thor holds the position of "the Eyes," one of four top executives within the Gui Carlin mafia organization. Upon learning of the Black Fairy Tome's appearance, he actively pursues it, eliminating guards to secure the artifact. When confronted by Veronica Thorn and Damien Carme over the tome, he overpowers them using his fairy Sharpsight, recognizing Damien's lineage connection to the tome's creators. Following their retreat, he reveals his own ancestral link to the author of the White Fairy Tome before destroying the location.

After Dorothea restricts sea travel from the island, he tracks Damien but encounters "Sweetie" Bitter Sweet alongside Veronica. Patricia Pearl interrupts their interaction, attacking with her fairy Boneless, but he easily defeats her using his fairy weapon. Bitter Sweet's subsequent attack also proves ineffective, forcing her retreat. During pursuit of Veronica, he encounters Free Underbar and Marlya Noel. After breaking one of Free's swords in combat, he challenges them to take the Black Fairy Tome from him.

Later, he relocates to his castle in Mazria in response to Dorothea targeting Gui Carlin members. There, he initiates mass production of fairy soldiers, exceeding fifty units. Dorothea eventually confronts him at this location. Though hoping to battle Nein, he instead faces Free. His attempt to use Sharpsight's ability against Free fails due to Free's fairy weapon. Their conflict moves to a tower within the castle, culminating in Free slashing him. Before falling, he severs the platform ropes, causing both to plummet. This results in his death from the fall, while Free survives due to Marlya's intervention.

His primary combat asset is the fairy weapon Morterant, originally wielded by Haristan of the Seven Knights but later coming into his possession. This weapon significantly enhances his combat effectiveness against other fairy users.