The Queen of Air and Darkness

The Queen of Air and Darkness is said to have no “real” corporeal form but often takes the shape of a Black Diamond (Night Diamond). She is the leader of the unseelie. 
The unseelie worship the Queen of Air and Darkness like a god, and her most devout followers are as if mind controlled. She spreads misery and gloom across the feywilds and she seems to grow in influence at the approximate same rate as the corruption in the dustlands spread.
The lands of the unseelie were once the domain of Dame Irulan of the Spring Breeze (sister of Queen Titania of the Summer Court), a land called The Dale of Dreams which was included in the territory of Oberon’s Spring Court. Dame Irulan was killed by the overpowering aethereal energies when the Lunar Cataclysm shook the material plane as well as the feywilds. Many of the fey of The Dale of Dreams perished as well and it is unknown if they have reincarnated as new fey or not. In their place came the Queen of Air and Darkness and her servants took over the land and made it what is now known as “The Untamed Lands of The Seelie Court”, unrecognizable from the once peaceful Dale of Dreams.