Daemons of Tzeentch treat Daemons of Khorne and Slaanesh as Suspicious Allies, and Daemons of Nurgle as Desperate Allies. All of the rules below also apply to mounts.
They have Hatred (Daemons of Nurgle), and re-roll Ward save results of 1. Wizards that are a Daemon of Tzeentch can also re-roll channelling results of 1.