Screaming Longbow

Arrows fired from this sickly longbow let out a screeching howl audible up to 100 feet away as they fly by. Creatures struck by these arrows take an extra 2d4 thunder damage. When you roll a 20 on an attack roll made with this weapon, all creatures within 5 feet of the target must succeed on a DC 15 Constitution saving throw or be deafened for 1 minute.