Blast weapons fire shells, missiles or energy bolts that explode on impact, potentially injuring several victims with shock waves and shrapnel. When you fire a blast weapon roll to hit as normal. If the shot misses it has no effect. If it hits place the appropriately sized Blast marker over the target unit to see which models are affected.
Models partially covered are hit on a D6 roll of 4 or more, models completely covered are hit automatically. The defending player has to remove any casualties inflicted from the models directly beneath the Blast marker.
Unscrupulous players may be tempted to use blast weapons to pick off leaders and heavy weapons in an unrealistic fashion. To prevent this the following rule applies. The owner of the target unit can move an incoming Blast marker onto a different part of the target unit providing that:
a) The Blast marker covers the same number of models (or more) in the same unit.
b) The new target is within the firer's range and line of sight.
Diagram: Blast Weapons — a Blast marker is placed over the target unit; models fully under the marker are automatically hit ("Hit"), while a model only partially under the marker's edge is hit on a D6 roll of 4+ ("Hit on 4+").