Wondrous Item, artifact (requires attunement by a monk)
Stored within this magic power gem is the strength of a pterodactyl. While attuned to the gem, you gain a +1 to AC and Strength, Dexterity, and Constitution saving throws.
As an action, you can unleash a cacophonous scream that affects in a 15 feet cone in front of you. Creatures in the area must make a DC 15 Constitution saving throw. On a failed save, creatures take 3d6 thunder damage and are pushed up to 10 feet away from you. On a successful save, they take half as much damage and are not pushed away. Once you use this feature, you can't use it again until the next dawn.
Notes: Bonus: Armor Class, Bonus: Strength Saving Throws, Bonus: Dexterity Saving Throws, Bonus: Constitution Saving Throws, monk