Some war machines, spells or magic weapons are so destructive that if a model is hit and wounded by them, the victim doesn't lose only 1 wound, but a number of wounds equal to the roll of a D3, D6, etc, (as noted in the weapon's rules). In such cases, roll to hit and to wound as normal and then take any armour saves and ward saves that apply. Finally, for each such wound that is not saved, roll the appropriate dice and add their results together to determine how many wounds are caused. If the model has only 1 Wound on its profile, there is no need to do this, as models cannot suffer more wounds than they have on their profile. The victim dies instantly and any excess wounds are wasted.