Blastrock Shaman

There are people in this world that seem to skip the line between bravery and insanity. Only the truely crazy handle the supstance called 'blastrock'. But these Shamans don't just carry the stuff, oh no, they take it a step further. Blastrock Shaman is the title given to the crewmates that handle the cannons. All that really know how a cannon is fired believe it to be pure lunacy. A cannon is shot by placing a chunk of blastrock at the bottom of the barrel, after which a cannonball is jammed in it with enough force that it hits the chunk and detonates. Only a madman would operate such a device...
 

Shamanic touch

All stability rolls made by the shaman succeed if they are higher than 2.  

Boomstick mastery

You are proficient with the hand cannon. It is a strength based ranged weapon with the two handed and heavy properties. It has a short range of 100 ft and long range of 300 ft and deals 2d8 bludgeoning damage, twice as much against buildings. When fired the user makes a stablility roll, on rolls under 11 the blastrock explodes early and deals 3d6 fire damage to the user. After the shot is fired the user is knocked back 10 ft (30 ft for small races) and has to make a strength save against a DC of 13 or be knocked prone.