This airfoil is composed of two types of stone. While the front edging is a lighter almost white stone, the inner edge is composed of a darker carved gray granite. It, along with some embellishments, holds most of the details carved into the design. To a careful eye, it seems to shake at the sound of distant thunder. 

Thunder Tide: On a hit, the user can choose to call forth a massive thunderous boom, dealing an additional 4d6 thunder damage to the target. All creatures within a 20ft radius must make a dc; 15 constitution saving throw, taking 4d6 thunder damage on a failed save and half as much on a successful one. this property cannot be used again until the next dawn.

The boomerang is a ranged weapon, and any creature proficient with the javelin is also proficient with this weapon.

On a miss, a boomerang returns to the thrower's hand.

Notes: Damage: Thunder, Thunder Tide: On a hit, the user can choose to call forth a massive thunderous boom, dealing an additional 4d6 thunder damage to the target. All creatures within a 20ft radius must make a dc; 15 constitution saving throw, taking 4d6 thunder damage on a failed save and half as much on a successful one. this property cannot be used again until the next dawn. , Range