Escanor, bearing the title Lion’s Sin of Pride, was born the second prince of Castellio. Cursed with the innate power of Sunshine, his strength surged under sunlight but dwindled to frailty after dusk. Daylight transformed him into an arrogant, domineering force, while night reduced him to a timid, apologetic soul; both personas remained acutely aware of each other, each harboring bitter envy toward the other. A childhood accident unleashed Sunshine’s destructive force, gravely injuring his elder brother and resulting in Escanor’s exile. Rosa, a compassionate woman, sheltered him from persecution, though communities continued to shun him as a monster despite his attempts to aid them.

Years later, his uncontrolled power ravaged Liones, drawing the attention of Meliodas and Merlin. Falsely accused of terrorizing villages, Escanor faced execution until Meliodas intervened, recruiting him into the Seven Deadly Sins. Wielding the Sacred Treasure Rhitta, his noon zenith granted unmatched might, toppling demons like Galand and Estarossa. During the New Holy War, Sunshine abandoned him until Mael, its original wielder, reignited the power within him—knowing its use would prove fatal. To protect his allies, he unleashed "The One: Ultimate," a transcendent state surpassing even the Demon King’s strength, sacrificing his life to ensure victory. In final moments, he bid farewell to comrades, proclaiming loyalty his true pride.

Escanor’s unspoken devotion to Merlin guided his actions—shielding her in battle, crafting poetry in her honor—though she never reciprocated. Tormented by pride in his power and shame over its isolating toll, his duality defined his existence. His legacy endured through allies’ memories, echoed in later events, though he appeared only as a fleeting mention in *Cursed by Light*.