Dark Sun: The Scorched World of Athas
In city-states and villages throughout Athas, a secret society of arcane spellcasters (and a few other who share their interests) practices the forbidden arts. The Veiled Alliance rejects defilers and all arcanists in the group are preservers. Each chapter operates independently and it is not uncommon for the goals of one chapter to interfere with another’s.
The Veiled Alliance opposes defilers everywhere, in particular the sorcerer-kings and their templars.