A wharfling that has an opponent grappled at the start of its turn can make a Dexterity (Sleight of Hand) check as a bonus action against a DC equal to 10 + the grappled target's Dexterity modifier. On a successful check, the wharfling steals a small metallic object from the target, and the theft is unnoticed if the check result equals or exceeds the target's passive Perception. A wharfling flees with its treasure.