Phlegyas served as the warden of the dark lake of the fourth prison in Hell. When the Saints of Athena had infiltrated the underworld the Specters were on high alert. Cygnus Hyōga, Dragon Shiryū and Gemini Kanon reached the dark lake together, but the only way to get across was by Phlegyas’ raft. He immediately attacked them, knocking the Bronze Saints unconscious with ease. Both landed on the raft which Kanon pushed out into the lake, and stood ready to fight the Specter. But the Gemini Gold Saint was far more powerful. Phlegyas was killed by a single attack from Kanon, leaving him free to jump on the raft.