Treason of Tzeentch is a hex spell with a range of 24". All models in the unit immediately make one close combat attack against the unit itself. Roll To Hit, To Wound and take saves as normal. The caster may choose which of the unit's weapons is used for these attacks, though any Parry or Dodge save does not apply, and neither does any special rules that only applies in the first round of close combat. This spell has no effect on single model units.