Blast Shot

Instead of a single hard ball, this ammunition is a bundle of large pellets, balls, or pieces of scrap metal, propelled a short distance by black powder and attacking all creatures and objects within an area. Both cannons and fiend's mouth cannons can fire this kind of ammunition. When such a siege engine fires this ammunition, it hits every creature and object within a 30-foot-cone burst. The siege engine makes attack rolls against each creature and unattended object in the burst. It must miss every creature or target to misfire, and a misfire generates the normal effect. It deals its normal damage on a hit, but does not ignore the hardness of objects.