Vingilot

Guided by the light of a Silmaril, Eärendil navigated Vingilot through the Shadowy Seas to the Blessed Realm of Aman; he was the first Mortal to do so. He was not allowed, however, to return to Middle-earth, except to join the host of the Valar in the final War of Wrath against Morgoth. With Vingilot, Eärendil slew Ancalagon the Black, the greatest dragon that ever lived.