Miasmal Shroud

The wizard calls forth a pale mist that engulfs the foe.
Pick 1 enemy unit within 18" of the caster that is
visible to them and roll 3 dice. For each 5+ that
unit suffers 1 mortal wound. In addition, if you
rolled a triple, subtract 1 from the hit and wound
rolls for that unit until your next hero phase. If
you rolled a double, subtract 1 from hit rolls only
for that unit until your next hero phase.