This is a non-physical attack. In case a Misfire is rolled on the first artillery dice, roll a D6 and consult the Warp Lightning Misfire chart.
The Warp Lightning Cannon fires like the normal cannon, with the following exceptions. A roll of a Misfire on the bounce means that the energy dissipates and no hits at all are suffered. If a number is rolled, centre the small round template where the shot first lands before the bounce, to represent the crackling and exploding ball of energy. The shot then bounces like a normal cannon ball.
All models touched by the template or the bounce suffer a hit at a S equal to the result on the Artillery Dice for the bounce roll. Note that only the model under the centre of the template and the bounce itself suffers Multiple Wounds.
The Warp Lightning Cannon cannot fire grapeshot.