Regardless, I found the notion of "eldritch" meaning "elf kingdom" simply too delicious to pass up. Riffing on the Lovecraftian associations and my recent flights of fancy regarding sword & planet stories, I decided to go all out and create a goulash of these elements. What I decided was that the elves of my as-yet-unnamed campaign world are in fact the degenerate remnants of a sorcerous empire of Chaos-tainted beings from the Red Planet. These "red elves," as they are sometimes called by the few who know of their existence, are among the most ancient civilizations in the cosmos. Their demon worship and black magic once gave them mastery over not just their home planet but also a large portion of the starting campaign world, until their hubris and infighting brought about their downfall. Now a dying race, the red elves — who call themselves "the Eld" — seem content to wallow in their decadence, but there is always the possibility that one or more of them might cast covetous eyes toward other worlds and once again open the portals that allow them to cross the ether that divides them …
and
Cruel and callous, the Eld look on all species other than their own as barbarous and fit only to serve as slaves or as test subjects for their dark experiments. Fortunately, the Eld are slowly dying and are rarely seen on worlds other than their ancient cities on Areon, but rumors persist of hidden enclaves elsewhere, where they hatch plots designed to return them to mastery over many worlds they enjoyed millennia ago.
See also
Grognardia: Eldritch
Grognardia: The Eld
Grognardia: Eldritch Weapons including the Arium Pistol