Choose a target unit exactly as if you were firing a stone thrower (guessing range from the caster himself) and roll for scatter. Once the location of the hit is determined, place the large template with the central hole over that point. If a Misfire is rolled then instead place the large template over the caster himself! Every unit touched by the template takes 3D6 Strength 1 hits, with no armour save allowed. This can affect friendly units and units in combat. Units with the Mark of Nurgle are unaffected, as they find it rather refreshing!