The Valar and Eldar now fully understood the extent of Melkor's treachery. Fëanor, upon learning of his father's murder and the theft of his prized Silmarils, named Melkor "Morgoth", or "Black Foe of the World" (literally "Black Enemy"). Now King of the Ñoldor, Fëanor delivered the most impassioned speech ever given in Arda, which he unwittingly filled with Morgoth's taint. He railed against the Great Enemy, but because of Morgoth's influence, he also blamed the Valar for Morgoth's deeds. He persuaded most his people that because the Valar had abandoned them, the Ñoldor must follow him to Middle-earth and fight Morgoth. Fëanor then swore the terrible Oath of Fëanor which all seven of his sons also proclaimed, vowing to fight anyone and everyone — whether Elf, Man, Maia, or Valar — who withheld the Silmarils, and invoking even Ilúvatar as a witness. This became known as the Oath of Fëanor and later the cause for great tragedy among his seven sons.
Seeking a way to get to Middle-earth, he went to the shores of Aman, where the seafaring Teleri lived, and demanded the use of their ships. The Teleri refused, and in response, Fëanor and his armed and impassioned Ñoldor attacked the lightly-armed Teleri, destroyed their settlements and seized the ships. This act is known as the First Kinslaying.
There were not enough ships to carry all of the Ñoldor across the sea, so Fëanor and his sons led the first group. Upon arriving at Losgar, in the land of Lamoth, in the far west of Beleriand, where [[Morgoth] ]and Ungoliant had passed not long before, they decided to burn the ships and leave the followers of Fingolfin behind. However, Fëanor accidentally left his son Amras in the ships, and he was burned alive. The earth being flat in those days, the remaining Ñoldor saw the flames, and perceived that if they were to go to [[Middle-earth[[, they had no choice but to cross the Helcaraxë. This they did under the leadership of Fingolfin, and suffered great losses along the way, which greatly added to the animosity they had for Fëanor and his sons.
Learning of the Ñoldor's arrival, Morgoth summoned his armies from his fortress of Angband and attacked Fëanor's encampment in Mithrim. This battle was called the Battle under the Stars, or Dagor-nuin-Giliath, for the Sun and Moon had not yet been made. The Ñoldor managed to win the battle, and disperse Morgoth's armies. Fëanor, still in a great rage, pressed on toward Angband with his sons. He came even within sight of Angband, but was ambushed by a force of Balrogs, with few elves about him. He fought mightily, hewing even after receiving several wounds from Gothmog, captain of the Balrogs. His sons came upon the Balrogs with great force of elves, and were able to drive them off. However, as Fëanor was being escorted off the battlefield, he knew his wounds were mortal. He cursed Angband thrice, but with the eyes of death, he knew that his elves, unaided, would never throw down the dark towers. At the moment of his death the passing of his fiery spirit reduced his body to ashes.