Honor's Call (5e Equipment)
From D&D Wiki
Firearm (flintlock pistol), rare
A flintlock pistol, with a small hatchet head on the end of the barrel. A clover has been engraved into the hatchet head. An aura of valor surrounds the weapon, and pulls worthy combatants to it's presence. The weapon can be loaded by standard flintlock rounds, and the hatchet does 1d4 slashing damage. The gun does 1d10 piercing damage, and on a critical hit, the target must make a DC 13 Wisdom saving throw. If they fail, an extra 3d6 lightning damage is done to the target, and half as much if the saving throw is a success.