Chariots of Tzeentch
From Warhammer - The Old World - Lexicanum
Chariots of Tzeentch are composed 2 Flamers on flying chariots, pulled by two Screamers of Tzeentch. They were part of the Demon Army in the Storm of Chaos.
Gaming reference
During the 5th Edition Chariots of Tzeentch were pulled by Discs of Tzeentch and piloted by one or two pink Horrors.