Boon of Mutation: Enemies of an Alter-kin Coven are under the constant threat of mutation, the unluckiest of them ending up transmogrified into a Tzaangor.
At the end of the charge phase, roll a dice for each enemy unit within 3" of a friendly unit from this battalion. On a 6, that unit suffers D3 mortal wounds. If any models are slain by this ability, before removing the first slain model, you can add 1 TZAANGOR model to an existing TZAANGOR unit in your army. If you do so, set up that TZAANGOR model within 1" of a friendly TZAANGOR unit that is within 9" of the slain model. The model can only be set up within 3" of an enemy unit if the friendly TZAANGOR unit was within 3" of that enemy unit before any models were added.
The TZAANGORS keyword is used in following Tzeentch warscrolls: