Fists of Gork

Great green fists rain down from the sky to pummel
the foe.
Pick 1 enemy unit within 24" of the caster that is
visible to them, and roll a number of dice equal
to the number of models in that unit. For each
6, that unit suffers 1 mortal wound. If the
casting roll was 10+, inflict 1 mortal wound for
each 4+ instead of each 6.