Eöl

In the fiction of J. R. R. Tolkien, Eöl, always called the Dark Elf was an Elf of Beleriand.

Warning: Plot details follow.

He lived in Nan Elmoth, nominally part of Doriath. Eöl was a great smith and friend of the Dwarves of Nogrod and Belegost. He forged two great black swords from a meteorite's metal, but had to give the sword Anglachel to Thingol as tribute for living in Nan Elmoth. The other sword, Anguirel, he kept for himself.

He ensnared Aredhel Ar-Feiniel sister of Turgon when she strolled in his forest, and wed her. Their son was Maeglin. Eöl hated the Noldor, and therefore refused Aredhel and Maeglin to seek out their kin. Aredhel and Maeglin later left for Gondolin, stealing Anguirel from him, and Eöl followed them. When denied permission to leave with Maeglin, he tried to kill his son. His poisoned dart actually hit and killed Aredhel, for which deed he was put to death.

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In the published The Silmarillion Eöl is portrayed as a Sindarin Elf, but from very late writings by Tolkien (specifically Quendi and Eldar, published in The War of the Jewels) it turns out that his final view of Eöl was that Eöl was an Avar who descended from the same clan of the Elves the Noldor had come from, but that Eöl hated them. Eöl's love for smithying and friendliness to the Dwarves is consistent with Tolkien's view of the Noldor in the First Age.