Thundershock

The wizard unleashes the power of Sigmar's
storm as a roiling wave of pure force.
Thundershock is a spell that has a casting value
of 6 and a range of 12" if the caster is a Knight
or 18" if the caster is a Lord or Draconith. If
successfully cast, roll a dice for each enemy unit
within range and visible to the caster. On a 3+,
subtract 1 from wound rolls for attacks made by
that unit until your next hero phase.