Remains in play. Pick an enemy unit. This can be a unit in close combat. If the unit is within 18" of the caster, place a coloured or otherwise distinctive dice next to the unit with the '1' side facing upwards. At the beginning of every friendly Magic phase, turn the dice so that the number is one higher than last turn. The number on the dice is subtracted from the Strength and Toughness of the target unit whilst the spell is in play. If the Strength or Toughness of a model in the afflicted unit reaches zero, then that model collapses into a pile of rotting flesh and is removed from play entirely. This can mean a whole unit is destroyed in a single turn!