Sword of Wounding
Weapon, Rare (requires attunement; cost 5000 gp)
Once per turn, when you use this sword towith a melee weapon attack, in addition to dealing the attack damage you may inflict it with a wound. A wounded creature takes 1d4 necrotic damage at the start of each of its turns for each wound you have inflicted this way. Whenever the creature is damaged by its wound, it can make a DC 15 Constitution , ending all wound effects it is suffering from on a success. Alternatively, the wounds can be healed if the wounded creature (or a creature within 5 feet of it) uses an action to make a DC 15 Medicine check, ending all wound effects it is suffering from on a success.
Damage dealt by this sword can only be regained by taking a—no other method, magical or otherwise, will restore the hit points.