Banjo of Heckling

This quaint, but finely crafted folk instrument allows the wielder to put off their opponent with an ironic or derisive melody. Once per short rest, you may use a bonus action to either cast vicious mockery, or impose disadvantage on the next ability/skill check that the target makes. The instrument has a single charge that is renewed after a short rest. Unlike the cantrip, this instance of Vicious Mockery may be cast as a bonus action, and the target must be within 30 ft. Additionally, the wielder may choose to forgo the psychic damage of the spell, and instead use an ironic melody to impose disadvantage on the targets next skill/ability check. In either case, the target must succeed on a Wisdom saving throw (DC 15) to avoid the effects. 

Notes: by a bard., Social, Utility, Instrument, Focus