Curse of Exsanguination

If successfully cast, pick 1 enemy unit within 18"
of the caster that is visible to them. That unit
suffers 1 mortal wound.
If that mortal wound is allocated to a model and
not negated and that model isn't slain by that
mortal wound, you can roll a dice. On a 4+, that
model suffers 1 mortal wound. If that mortal
wound is allocated, not negated & the model isn't slain, keep rolling dice until either no mortal
wounds are inflicted, the mortal wound is
negated or the model is slain.