Unchecked Mutation

Unchecked Mutation has a casting value of 6. If successfully cast, pick 1 enemy unit within 18"
of the caster and visible to them. That unit
suffers D3 mortal wounds. If any models from
that unit are slain by this spell, you can roll a
dice. On a 3+, that unit suffers an additional D3
mortal wounds and this spell ends.