TV-Series
Description
Sheyta Synthesis Twelve achieved Integrity Knight status by winning the Four Empires Unity Tournament, though records of her victory were expunged due to her lethal actions. A suppressed compulsion to visualize and create cleanly sliced cross-sections of objects and living beings resulted in the deaths of all her opponents. Administrator Quinella perceived this tendency and crafted the Divine Object-class Black Lily Sword—a rapier capable of cutting anything—after Scheta retrieved a black lily from the Dark Territory. Roughly one year later, Sheyta accidentally killed another Integrity Knight in a duel. Fearing her uncontrollable destructive impulses, she requested and entered prolonged hibernation within the Central Cathedral, remaining dormant until after Quinella's demise during the Axiom Church's restructuring.

Known as "The Silent," Sheyta avoided nearly all speech and consciously minimized her presence to deter combat challenges. Her appearance reflected this reserve: tall and slender, with long dark-gray hair in a tight ponytail, emotionless almond-shaped eyes, and plain matte-gray armor contrasting with typical knight attire. She carried the Black Lily Sword on her left waist. Emitting no hostility, her combat style remained unilaterally lethal.

During the Underworld War, Sheyta commanded the right flank of the Human Guardian Army's Second Unit at the Great Eastern Gate. She later joined the decoy unit penetrating the Dark Territory. Mounted on her dragon, Yoiyobi, she confronted the pursuing Fistfighters Guild led by Iskahn. Recognizing her unique ability to stall them, she engaged Iskahn in single combat. Her Black Lily Sword pierced his near-impenetrable skin, culminating in a fierce duel that forged mutual respect. She withdrew as ordered, rejoining the decoy force.

A pivotal shift occurred battling invading American VR players. Facing annihilation alongside Iskahn, Sheyta experienced a profound realization: she desired "someone she did not wish to cut." This emotional breakthrough shattered the Black Lily Sword, intrinsically linked to her destructive nature. Subsequently known as "Sheyta the Unarmed," she embraced this transformation, symbolizing her rejection of violence. Post-war, she married Iskahn and they had a daughter, Lisetta. Residing in Obsidia Castle, she served as chief ambassador between the Human Empire and Dark Territory. Though wielding no weapon, she became a respected instructor at the Dark Knights’ dojo. Her dragon, Yoiyobi, remained her companion.

In an alternate timeline (32/33), she served as an instructor for apprentice Integrity Knights Eugeo Synthesis Thirty-Two and Kirito Synthesis Thirty-Three.