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 use its warp-power accumulator to augment the spell. If you do 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