Psurlon
'Psurlons are a species of highly intelligent, worm-like aberrations who are the transformed remnants of a race of humanoids whose pursuit of power through psionics destroyed their home world and warped them into their present form.
After the destruction of their homeworld, the race was cast out into the Astral, eventually coming to manifest again on Athas.
They were a species invented for the Dark Sun videogame "Shattered Lands", but were so well received that they received official Advanced Dungeons & Dragons monster write-ups in two of the Monstrous Compendium Appendixes (Dark Sun 2, Planescape 3).
They were subsequently updated to Dungeons & Dragons 3rd Edition, making their debut in the Monster Manual 2, and were then expanded upon in the 3e splatbook Lords of Madness.
Dungeons & Dragons 4th Edition saw them return in the [Dark Sun]] Creature Catalog.