Kiel was a high level member of the Blood Spiral team known as the Casterwill Hunters. Along with his tracker, Marduk , he was responsible for the eradication of numerous Casterwill branches, including the parents of Sophie and Lucas Casterwill , whose home he burnt down.
Kiel's choice Titans and spells were typically fire-related, matching his explosive disposition and hot temper. As the most brutal of Tantras ' acolytes, Kiel was the only student to ever surpass his master. Young Kiel burns Sophie's home. Kiel was responsible for the death of Sophie and Lucas Casterwill's parents and for the burning of their house in Paris, France. Kiel was sent by Tantras to Medusa's Island to oversee the Organization spy, Stack , in his promise to recover Medusa.
Lok was able to recover Medusa and the Huntik team made a swift escape, leaving Kiel to knock Stack unconscious and take him back to Tantras as a prisoner. Sophie, however, became certain she recognized him. Kiel later attempted to steal the secrets of the Casterwill family from Focauld Casterwill with the aid of his Ignatius Titan, Marduk , and the Casterwill Hunters.
However their assault was interrupted by the arrival of the Huntik team who rescued Focauld and escaped with the Casterwill Crystal containing the family's secrets. Kiel and his men later travelled to Mexico to stop the Huntik team from activating the Blue Star to call the Casterwills out of hiding. After an attempt at kidnapping Den Fears , Kiel and his men chased the team to the Temple of Sun where they were held off by Dante Vale.
Kiel then overpowered Sophie Casterwill and revealed to her the truth of how he killed her parents. During the assault on the Fortress of Iron Will , Kiel led the Casterwill Hunters in an attempt by the Blood Spiral to eradicate every living member of the family at once. He and his Titans were defeated when Sophie invoked Powerbonded Sorcerel and Mythras , the Legendary Titan of Valor before using Soulburn 's power to defeat him and his two invoked Titans.
