Epic Volley

Your ranged weapon mastery has caught the eye of a higher power, which occasionally multiplies your attacks.

When making a ranged weapon attack as part of the attack action, you can cause your attack to become a magical volley. Instead of making an attack roll, choose a 20-foot sphere and roll for damage. All creatures within the area must make a Dexterity saving throw. On a fail, the creature takes piercing damage equal to 5 times your damage roll, plus your Dexterity modifier. On success, the creature takes half damage. You can't combine this feat with any other feat or feature.

Once you use this feat, you can't use it again until you complete a long rest.