Forge Ringer (5e Equipment)

Weapon (any hammer), rare (requires attunement)

You gain a +2 bonus to attack and damage rolls made with this magic weapon. As an action while you are holding this weapon, you can strike it against an object to repair a single break or tear in the object, such as a broken chain link, two halves of a broken key, a torn cloak, or a leaking wineskin. As long as the break or tear is no larger than 1 foot in any dimension, you mend it, leaving no trace of the former damage.
This property can physically repair a magic item or construct, but the property can't restore magic to such an object.
Additionally, the weapon doesn't cause a sound when hitting other objects unless you want it to.