Blast Weapons with [BLAST] in their profile are known as Blast weapons, and they make a random number of attacks. Each time you determine how many attacks are made with a Blast weapon, add 1 to the result for every five models that were in the target unit when you selected it as the target (rounding down). Blast weapons can never be used to make attacks against a unit that is within Engagement Range of one or more units from the attacking model’s army (including its own unit).
Indirect Fire Weapons with [INDIRECT FIRE] in their profile are known as Indirect Fire weapons, and attacks can be made with them even if the target is not visible to the attacking model. These attacks can destroy enemy models in a target unit even though none may have been visible to the attacking unit when you selected that target.
If no models in a target unit are visible to the attacking unit when you select that target, then each time a model in the attacking unit makes an attack against that target using an Indirect Fire weapon, subtract 1 from that attack’s Hit roll and the target has the Benefit of Cover against that attack.
