Remains in play. Heart of Winter is a direct damage spell with a range of 18". All models in the target unit must take a Toughness test or suffer one Wound which Ignores Armour Saves. This is an Ice Attack. In addition, it has all its Movement halved until the start of the caster's next turn. The Wizard may choose to increase the range of this spell to 36". If they do so, the casting value is increased to 19+.