Made for warfare in water depths, this apparatus employs vibration to destroy your opposition. It has 4 charges that are regained at dawn.
Concentrated Blast. As an action, you expend 1 charge to emit a concentrated sound blast with the cannon in the direction of a creature within 30ft: they must make a DC 14 Concentration save or take 2d6 thunder damage and be knocked prone, suffering half damage and not being prone on a success.
Resonant Crash. Specially tuned to propagate sound waves in liquid, the cannon can cause vicious damage to creatures to a creature with liquid inside them or make of it. You use an action to expend 1 charge to make an unarmed attack against a creature within reach, unleashing sound waved into their body and dealing 3d6 thunder damage on a hit.
If the creature's made of liquid or has liquid inside them (such as blood), they make a DC 14 Constitution save or takes an extra 1d6 piercing damage at the start of each of its turns for 1d4 rounds.
Wavefarer. You produce a repeating pattern of subtle sound waves that helps you detect the unseen and as action by expending 2 charges. For a minute, you have advantage on Perception checks made to find hidden creatures, and you don't suffer penalties for interacting with an invisible creature.
Notes: creature
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