Curse of Exsanguination

Curse of Exsanguination has a casting value of 7
and a range of 18". If successfully cast, pick 1
enemy unit within range and visible to the caster.
That unit suffers 1 mortal wound. If that mortal
wound is allocated to a model in that unit and the
model is not slain by that mortal wound, roll a
dice. on a 3+, that model suffers 1 mortal wound
and you can roll another dice if that model is not
slain. Keep rolling dice in this way until no
mortal wound is cause, the mortal wound is
negate