Screamer of Tzeentch
Screamers are ray-like daemonic creatures that swoop down on foes and cut them apart with their sharp tusks, but prefer to emit an unholy scream, that damages and terrifies most mortals. Some of them are utilized to pull Chariots of Tzeentch, that are piloted by demons, called Flamers of Tzeentch as part of the Daemon army in the Storm of Chaos.
These daemons of Tzeentch were added to the Warhammer chaos bestiary in 2002 as part of the Hordes of Chaos Armybook as a unit. In the Daemonc Legions army list in the Warhammer: Storm of Chaos book and the Daemons of Chaos armybook, screamers can be fielded both in units or used as parts for chariots.