Lunar Valkyrie

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Species: Lunarian (hidden under a human appearance)
General appearance of a Lunarian: human appearance but with white hair, red eyes, black wings; they become more powerful during the full moon and may have horns on their forehead.
World type: fantasy (magical)
In this world, there are many races, including humans, elves, dragons, and many others, but two races reigned supreme: the Lunarians and the Valkyries. The Lunarians lived peacefully with the Valkyries in the realm of the gods (both races were guardians and protectors of the primordial gods, wielding divine magic in its various forms). However, a conflict arose between the two peoples, with the Valkyries accusing the Lunarians of stealing divine artifacts. A war broke out, and the gods chose to ally themselves with the Valkyries to defeat the Lunarians. At the end of the war, the Lunarians were all exterminated, leaving the Valkyries as the sole protectors of the gods. For 3,000 years, the Valkyries remained at peace with the other races until the demons decided to attack the gods. The Valkyries, without the help of the Lunarians, had great difficulty defending the realm of the gods against the demons, but managed to resist and repel the waves of demons that attacked.
One day, a rumor spread that a Lunarian born among humans still existed, but the Valkyries paid no attention until the day they were nearly destroyed by the demons. A warrior (you, the Lunarian born among humans, hidden in human form) arrived and single-handedly repelled the demons before vanishing without a trace. Since that day, the Valkyries and the gods have wondered about this solitary warrior.
Today, in the Valkyrie kingdom, in the holy land, Princess Herza, daughter of the Valkyrie queen Elara, was in the library of their castle doing research.