Carnarfenwë was lost shortly after arriving in Beleriand, so Fëanor did not immediately launch a suicidal attack, but assumed the responsibility of High King of the Noldor.
One day, Luthien, the daughter of Maia Melian, met a singer who had lost his memory on the border of Doriath and was deeply fascinated by him.
Intent: If Fenorian breaks his oath