Wondrous Item, Rare (Requires Attunement)
These chitinous greaves produce a curious sound when rubbed together. While wearing these greaves, your horizontal and vertical jump distances are both doubled. This item has a number of charges equal to half your proficiency bonus and regains all expended charges when you finish a long rest.
Noisy Cricket. You can spend a charge as an action to produce a furious chirping from these greaves. Each creature within 15 feet of you must make a Constitution saving throw (DC 16), taking 3d6 thunder damage on a failed save or half as much damage on a successful one.
If a creature must make a Constitution saving throw to maintain concentration due to this damage, it does so with disadvantage.
Tough Crowd. When a creature you can see within 60 feet of you fails a d20 check, you can spend a charge as a reaction to produce a mocking sound from these greaves. The creature has disadvantage on the next d20 check it makes within the next minute.
Pay its incessant chirping no mind, lest it drive you mad.