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Years before 429 BCE, the Swordfish and three other men went into the Minotaur's labyrinth seeking riches and glory. One of the men, Nikios, was killed by the Minotaur and the others barely managed to escape alive, sealing the labyrinth behind them. 
In 429 BCE, he was found by the Spartan misthios Kassandra while she was seeking information on Nikios at the request of his orphaned son Ardos. Swordfish didn't offer any help, instead attacking Kassandra, who killed him in self-defense. Kassandra then took Swordfish's piece of Theseus's armor from his body.
Personality and characteristics
After his traumatic experience in the Minotaur's labyrinth, Swordfish's mental state was always in disarray, and he had a habit of talking to himself. He had seemingly grown disillusioned with the Cult and desired to desert it. He attacked Kassandra on the mistaken assumption that she was the Cult's enforcer, Deimos, and was there to either kill him or capture him.