Chain Lightning

Chain Lightning 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, pick 1 enemy unit within
range and visible to the caster. That unit suffers
D3 mortal wounds. Then, roll a dice for each
other enemy unit within 6" of that unit.
On a 3+, that other unit suffers 1 mortal wound.