Flail of Wounding

Weapon (flail), rare (requires attunement)

Hit points lost to this weapon cannot be regained through regeneration, spells, or other magical means. In addition, when you hit a creature with this weapon, the target gains a wound. Each wound causes the creature 1 hit point of damage at the beginning of its turn. A wounded creature can attempt a DC 15 Constitution saving through, ending the effects of all wounds on a success. Alternatively, a creature within 5 feet of the wounded creature may use an action to attempt a DC 15 Wisdom (Medicine check), ending the effects of all wounds on a success.