When Byleth attempts to sacrifice their life to save Edelgard from bandits, Sothis grants Byleth the ability to use Divine Pulse, a power that can both stop and turn back time to a limited extent. Their lack of emotions was also evidence that they were being kept alive by the crest stone, until such time as the sleeping Sothis made herself known to Byleth, albeit in the underdeveloped form of a young girl. Byleth grew up in Jeralt's care, but they still lacked a pulse. Jeralt, suspicious of Rhea as the cause of Sitri's death, used a fire as cover to escape the monastery. As a result, Sitri voluntarily gave the child her crest stone to allow them to live, though at the cost of her own life. Due to Sitri's secret inhuman nature, the child, Byleth, was stillborn with no heartbeat. While Sitri was unable to unlock its power, she fell in love with Jeralt on account of her incredible kindness, and had a child. Byleth was the child of Sitri, an artificial "vessel" created to carry the Crest of Flames crest stone. It is later revealed that they carry the goddess Sothis within them as a result of Archbishop Rhea's experiments into reawakening her mother. Throughout the game, Byleth's only known relative is their father Jeralt Eisner, a renowned mercenary who once fled Garreg Mach Monastery. They possess the mysterious Crest of Flames and can wield the Sword of the Creator.
Byleth serves as a professor at Garreg Mach Monastery. Appearances In Fire Emblem: Three Houses īyleth is a central character whose name and gender can be customized by the player.