its not Feanor but heres the proph:
According to the prophecy, Melkor will discover how to break the Door of Night, and will destroy the Sun and the Moon. For the love of these, Eärendil will return from the sky and shall meet Tulkas, Manwë (or Eönwë his herald) and Túrin Turambar on the plains of Valinor. All the Free Peoples of Middle-earth will participate in this final battle, Elves, Men and Dwarves alike. To their number will be added Ar-Pharazôn and the Númenóreans who landed at Aman in 3319 SA.