Thunderdrum

Thunderdrum cannons are huge and cumbersome apparatuses made of an magically infused wood and reinforced with Orichalcum. The cannon doesn't require ammunition, but consume on barrel of Thuud with each shot. The Thuud is compressed and activated into a concentrated blast of pure concussive energy. Whenever an attack roll is made with this cannon, and the dice roll is a 1 the weapon misfires. The attack misses, and the Thunderdrum cannot be used again until you spend an action to try and repair it. To repair the Thunderdrum, you must make a successful Tinker's Tools check, (DC 18). If your check fails, the Thundedrum is broken and must be repaired out of combat at half the cost of the Cannon. 
Thunderdrum Cannon. Ranged Weapon Attack: +4 to hit, range 700/2800 ft., one target. Hit: 55 (10d10) Force damage.
Category:Ship Magic Items