Siren's Call Violin

Uncommon Wondrous Item (Musical Instrument, Viol)
Requires attunement by a Bard

Song of the Siren. You may cast the spell Charm Person or Animal Friendship at 1st level using this violin. This feature can be used once per day and regains its use after the next dawn. Enchanting Melodies. When you use this violin to cast a spell that causes the target to be Charmed by you, the DC for the saving throw is increased by 2 and the duration of the spell is doubled.