Created from the raw stuff of magic by the Changer of Ways, the Daemons of Tzeentch blur with ever-changing colours and crawling warpflame.
Daemons of Tzeentch have the Hatred (Daemons of Nurgle) special rule. In addition, a Daemon of Tzeentch that is also a Wizard may apply a +1 modifier to any Casting roll they make.
Note that this is a modifier to the result of a roll – it does not negate a roll of a natural double 1.