Forgotten Realms Pathfinder: Shadows of Faerun
Red Wizards are the usually notorious and nefarious spellcasters who are the ruling class in the inhospitable but well-inhabited country of Thay. The Red Wizards are slavers, demonologists, magical experimenters and scholars. They constantly scheme to bring down their neighbouring nations of Rashemen—where they are thwarted by the Witches of Rashemen; Aglarond—where they are turned back by the Simbul of the Seven Sisters; and Mulhorand—where the people of Thay originated. There are certain academies, such as the Academy of Shapers and Binders in Thaymount, that are considered “anomalies” among the Red Wizards, as they discourage betrayal, deceit and slavery; their members show compassion and mercy unlike most others of their kind.
The leaders of the Red Wizards are the eight zulkirs, each for a different school of magic. Chief among these is Szass Tam, an undead archmage.
The Red Wizards are described as the enemies of many forces in Abeir-Toril—whilst they receive support from demons and devils and drow, among those who oppose them are the Witches of Rashemen, the Seven Sisters and their allies, the goodly Harpers, and even the Zhentarim, who dislike the wizards encroaching on their territory.