Stream of Corruption

Stream of Corruption is a spell with a casting
value of 6 and a range of 7" (or 14"). If
successfully cast, pick 1 enemy unit within range
and visible to the caster. Roll 1 dice for each
model in that unit that is within range of the
caster. For each 5+ (or 6+ if using the 14" range)
that unit suffers 1 mortal wound.