Greatbell Hammer (Patreon)

Weapon (maul or warhammer), very rare (requires attunement)

This hammer emits a deep, resonant toll whenever you hit a target with it, which is audible out to a range of 30 feet. A target hit with this hammer takes an extra 1d12 thunder damage from the attack; on a 12, you can immediately cast the thunderwave spell from the hammer (save DC 16). This version of the spell creates a 15-foot cone, rather than a cube, which originates from the hammer and must be in the direction of the target of the attack. A creature that fails the saving throw against the spell is also deafened for 1 minute.

Ding dong! Ding dong! Din.... booom!