Tree Singing is an augment spell which targets a single forest within 24" of the caster. If there are no units within the forest, it immediately moves up to D6+1" in a direction of your choice. A forest cannot move to within 1" of units or other terrain features.

If there is at least one unit (friendly or enemy) within the forest, then the forest does not move. Instead, choose a single enemy unit at least partially within the forest; that unit immediately suffers 2D6 Strength 4 hits. The Wizard can choose to instead have this spell target all forests within 12". If they do so, the casting value of the spell is increased to 12+.