Warp Lightning Storm

Pick up to D3 enemy units within 13'' of the
caster and visible to them. Those units each suffer
D3 mortal wounds.
Before making the casting roll, you can say that
this model will augment the spell.
If you do so and the casting attempt is successful
and not unbound, the spell inflicts D6 mortal
wounds on each of those units instead of D3.
However, if you do so and the casting attempt
fails or is unbound, this model suffers D3xD6
mortal wounds.