Stream of Corruption

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+, that unit suffers 1 mortal wound.

Before attempting to cast this spell, you can say that the caster will project the stream across a greater distance. If you do so, the spell has a range of 14" but only inflicts 1 mortal wound for each roll of 6 instead of each roll of 5+.