Evil wizards. Love necromancy. Love power. Love evil things for no other reason than its a form of power.
They exist in the north east of Fae-run, deep in the barren mesas away from those who would, and really would, cause them trouble.
The majority of Red Wizards are subject to the Tharchions, and the leader of those Tharchions being Szass Tam, an extraordinarily powerful lich.
One particular Red Wizard, Rath Modar, took a sect of Wizards with him to help with the rise of Tiamat, something that Szass Tam is more than a little upset about.