Isley is a male Awakened being and was once the Number 1 warrior of the Organization's first generation. In his transformed state, he resembles a sleek black centaur with his right arm capable of transforming into a lance or axe, and his left arm into a bow or shield. He skillfully fires homing arrows.
Isley initiated the Northern campaign with the aim of killing Luciela and taking over the south to become an unrivaled power by preventing an alliance between Riful and Luciela against him and Priscilla. He sacrificed his awakened followers to distract the Organization and Riful while he went south to eliminate Luciela. The Organization sent 24 Claymores to slow down Isley’s allies as they prepared Alicia for controlled awakening.
During the Northern campaign, Isley found Raki and took him in. Later, when Raki complimented him on his sword skills, Isley agreed to become Raki’s teacher and began instructing him in swordsmanship. Isley remarked that Raki reminded him of his younger self.
In the seven years following the dispatch of the awakened beings to the west and east, it was discovered that Isley emerged victorious against Luciela, though both were nearly killed in the battle. Isley remained quiet for the next seven years until he was discovered being hunted by Abyss feeders. Eventually, he succumbed after being slowly devoured.
During this time, what happened between Luciela and Isley was recounted by Riful, who visited Isley with the intention of slaying him but instead discovered Priscilla. She learned that Isley, who supposedly defeated Priscilla, was obliterated by her in an instant and had submitted to being her general, covering up the story. Isley cunningly set his plans in motion, knowing that only something stronger than the Abyss could defeat Priscilla. By eliminating Luciela, one of the three Abyss beings, he prevented Riful and Luciela from forming an alliance, leaving no opposition to Isley.
