The Noctuary (D&D 3.5e, Level 20+ Adventure)

[chaincomplex]

Dark sun is most definitely an official setting

If you scroll down it has the wotc licensing https://www.athas.org/

Noted. I knew Dark Sun in 2e was official, but wasn't aware WotC recognized any 3e source.

athas.org is considered approved material, though as I mentioned above with Dragonlance, I haven't gone through it so I'll take it on trust that you'll let me know if something borked is coming out of there,