When you choose an Tzeentch army, you can give it a Change Coven keyword from the list below. All DISCIPLES OF TZEENTCH units in your army gain that keyword, and you can use the extra abilities listed for that Change Coven on the page indicated.
• ETERNAL CONFLAGRATION (pg 78)
• HOSTS DUPLICITOUS (pg 79)
• HOSTS ARCANUM (pg 80)
• CULT OF THE TRANSIENT FORM (pg 81)
• PYROFANE CULT (pg 82)
• GUILD OF SUMMONERS (pg 83)
If a model already has a Change Coven keyword on its warscroll, it cannot gain another one. This does not preclude you from including the unit in your army.