These are colloquially called "Coal Cannon" as they are black as coal. In reality, they are in fact made of cast iron. Breach loaded, these cannons stack up in power as their size increases. Ammunition for this cannon varies, as they can fire a regular cannon shot, or they may fire grape shot which is deadly to any personnel unfortunate enough to cross it.
- Melon seeds
- - This is referred to as grapeshot.
- - This is the cannonball, used to pierce armor on enemy ships.
- Hidden blocks:
- - There is a button behind the cannon, and so is a repeater. The button should be on the coal block where the torch is, and the repeater is adjacent to it.