Storm Strike. As an action, you can strike this drum to sound a thunderous boom that can be heard from up to 300 feet away. All creatures in a 15 foot cone outward from you have to make a constitution saving throw (DC 16). On a failed save, a creature takes 5d6 thunder damage and is stunned until the end of their next turn. On a successful save, the creature takes half damage and is not stunned. This feature can be used once, and regains its use at dawn of each day.

Notes: being proficient with drums