Svartalfar
Within the Norse mythology, Svartalfar (black elves) lived in Svartalfaleim which was also the world where the dwarves lived. It’s is possible that to see the same division in the elvish world between the well-disposed and the hateful elf as there is between the fairy courts of the Seelie (Blessed Court) and the Unseelie (Unholy Court).
John and Caitlin Matthews, The Element Encyclopaedia of Magical Creatures, 2013, Svartalfar, p 446
thestrangemythworld 