P.S. - As far as I can tell, the clear basis of dark elves in our game is derived straight from Dungeons & Dragons, not Norse mythology, and the history of dark elves in D&D has nothing to do with Norse mythology (and is actually a little bit racist).
Drow: Drow are a species of elf in the Dungeons & Dragons roleplaying game. Etymologically, term is probably derived from the Shetland Isles Drow (Webster's Unabridged Dictionary (1970) states: "Drow, n., [scot.] A tiny elf which lived in caves and forged magical metal work."). The word's origin is identical to the origin of the word "troll," which both go back further to the Scottish Gaelic word spelled "trow." The original Scottish Gaelic word is pronounced "dtrow" with a soft "dt" sound, and the original pronunciation sounds similar to "troll." The word is also found in Cornish and Welsh, with slight pronunciation differences. The race itself seems based on another dark elf, specifically the Dokkalfar of Norse mythology.
Not actually a little bit racist.
Please do not assume something, to make it fit your argument.
Having researched this further, I offer Gary Gygax's own words for greater accuracy.
Nothing like [the Drow race] is found in any Norse mythology at all. Dockalfar had crow's feet and were ugly. The Scots "drow" were simply "dark elves." Thus TSR, now WotC/Hasbro can claim rights to the Drow as depicted in the D&D game system because of the unique nature of their description and attributes.
Gary Gygax (1938–2008), February 5, 2004,
EN World Q&A VI
"Drow" in an Anglo-Saxon word. I found it in an old unexpurgated dictionary way back when. It means "dark elf." From that entry I created the drow race for AD&D, of course. There is no other background for them in myth or fable. Their characteristics were designed as they were to make them a suitable set of inhabitants of the subterranean world.
Gary Gygax (1938–2008), October 23, 2002,
EN World Q&A I
I wanted to have a new, unique, and interesting race of demi-humans that dwelled in and command much of the vast underworld of Oerth. They were, as stated, of Evil bent as a race, so the clear intent was to have fell opponents for non-Evil PC. That all drow were not of Evil I also noted in the "Gord the Rogue" tales, for Leda, a drow, was certainly not of malign sort.
The drow abilities were given to them to highlight their unique nature and potency.
Gary Gygax (1938–2008), October 14, 2002,
EN World Q&A I