Seth

"'...Well, we'll see how this holds. I'm lucky I even managed to live through that to be fair...' - Seth, after the bombing of Insomnia which he barely survived"

Fission Curse - Origins
Seth 'Karnofel', or simply Seth, was a citizen of the Dragon's Breath village in Eos who moved to Insomnia at the request of his master, Tael to stay with Kosmos at the Citadel of Insomnia, where Excellion was stationed at the time also. However, Insomnia was shot with a Photon Ray from Orbit at the end of the war arc together with Wyveria, causing the citizens of Insomnia that did not flee to perish within the city. Seth, due to the fact that he had been absent from the Citadel for a number of days now on his own affairs around Insomnia, was oblivious to the plan of escape that Excellion provided initially to Kosmos and him both, and ended up being blown appart with the city.

Miraculasly, he managed to survive the impact with several parts of his body becoming obsolete due to the blast damage he understood, causing him to pass due both due to severe pain, and bleeding. When he woke up, a couple hours after the explosion and the screams had quelled within the city, he found himself in a new body, one which he did not understand how it even happened and still does not. It looked similar enough to his so he did not mind it that much - The only problem with this body however, were his hands, blackened and with purple claws, a thing which he came to adress as NULL Hands. Since that day, he lost contact with his old comrades and has been searching for what the hell happened that day, trying to find a reason as to how he even got his body reconstructed like that. Currently, at the request of Okada about 5 years after the incident, he was asked to stay on guard in Caelum, and in exchange he'd allow himself to figure out what happened. Seth reluctantly agreed, and now aims for CT's head also.