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There is a Legacy version here.

PFS LimitedDragon Turtle ArtilleryItem 10

This Item may contain spoilers from the Season of Ghosts Adventure Path

Uncommon Magical 
Source Season of Ghosts (Hardcover) pg. 302
Price 1,000 gp
Usage held in 2 hands; Bulk 3
One end of this heavy cylinder of steel has been forged in the likeness of a dragon turtle’s head, the mouth gaping wide. Grips at the opposite end allow one to hold and aim this heavy cannon-like barrel with both hands. As long as you’re carrying dragon turtle artillery while you’re on a boat or ship, the DC for any effect to capsize that vehicle increases by 4.

Activate—Turtle's Tsunami [two-actions] (concentrate, manipulate, water); Frequency once per day; Effect A 50-foot cone of surging water blasts from the mouth of the cannon, dealing 10d6 bludgeoning damage to creatures in its area of effect (DC 27 basic Reflex save). A creature that fails its save is knocked prone.