Marble of the Cross-eyed

it is said that this item was made by a rogue of Crook Crag who loved to gamble with marbles but hates to lose.

Marble of the Cross-eyed

Wondrous Item

Common

As a bonus action, you can shoot this marble at an enemy within 20 feet. You make a dexterity-based attack roll and on a successful hit, the target has disadvantage on its next roll.
Once the marble is used it can not be used again until dawn.

"A little black marble"

Cost: 100 gp
Weight: .1 lb