Dark elves are known for their aggression, deceit, and stealth. They are very brutal and cruel by nature, having little mercy when it comes to cheating, battling, or anything dealing with the life of another being. They have little respect for even their own kind, at times waging war against each other. However, clans are known to band together, to combat invasions and attacks by other races. They do not mix blood with other races. They lurk in dark places and love the shadows. Rarely will they come into the light for needless purposes, but it is not usually believed light will harm or weaken them. Their weakness varies upon legend, and may include excessive heat, rain, nettles, or the blossoms of some plants and trees. Dark elves generally travel in pairs or groups, as their tendencies towards cheating and theft make them targets for retaliation and violence at the hands of other races.
The Dark Elves, were not always as they are today. They once lived on the surface with the other elves, mostly in the hotter regions of the south. They were called "Lil'Ilythiiri", meaning "Elves of the South". During the Elven Wars Araushnee bade her followers to rise up against her husband Correllon, Creator and God of all Elves. For this Araushnee was banished and became the goddess we now know as Lolth. Her followers were banished as well, and became the elves we now call "drow".
After their descent into the Underdark, they were renamed 'the drow'. The original term was "Dhaerow", an elven word meaning "traitor". It was later shortened to "Drow" by the humans.
~ Fantasy Mythos