Thwackstaff

Quarterstaff Damage: 1d6 (V:1d8) Bludgeoning
Band Damage: 1d4 Slashing (Finesse)
Modifiers: Melee Attacks +1, Melee Damage +2
Once per turn, as a bonus action, when you hit
with this Magical Weapon, you may utilize the
colorful band wrapped at the end as a whip to
make a single attack against any creature within
10 ft.
Creatures also provoke attacks of opportunity
out to a range of 10 ft. from the band.
Requires Attunement.