Treason of Tzeentch is a hex spell with a range of 24". Until the start of the caster's next Magic phase, the target unit must use the lowest Leadership value in the unit (instead of the highest as would normally be the case) and cannot benefit from the Inspiring Presence or Hold Your Ground! Special rules. The Wizard can choose to extend the range of this spell to 48". If he does so, the casting value is increased to 10+.