Wall of Thorns is an augment spell that is cast on the Wizard and any unit they are with. Until the start of the caster’s next Magic phase, the Wizard and their unit counts as fighting behind a defended obstacle, and any enemy models in base contact that charges them must take a Dangerous Terrain test. The Wizard can choose to extend the range of the spell to cover all friendly units within 6". If they do so, the casting value is increased to 14+.