The millennium-old Spirit Divine Realm falls to a brutal demon invasion, reducing the entire elven race to cruel slavery. As the last royal heir of the fallen elves, Ella endures a century of bitter bondage. Abandoning her innate sacred healing talent, she awakens the forbidden deadly power, Blood Feather Slaughter. Rising from the lowest demon slave camp, she gathers scattered elven survivors, wields blood-feather blades to launch a steady uprising, and overturns the tyrannical demon rule step by step. Standing atop the ruined holy realm, she finally avenges her race by defeating the demon king and rebuilds a brand-new order for the elven clan.