Black Whirlwind is a direct damage spell. Place the small round template anywhere within 24" - it then scatters D6". All models underneath the template suffer a Strength 3 hit. The unit then suffers -1 to their Weapon Skill, Ballistics Skill and Initiative until the start of the caster's next Magic phase. The caster can choose to increase the power of this spell to use the large round template instead. If they do so, the casting value is increased to 13+ and the template scatters 2D6" rather than D6".