Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 10 (2d6 + 3) slashing damage plus the target takes an additional 7 (2d6) necrotic damage, or half as much on a successful DC 12 Constitution saving throw. If the save is failed, the target takes this damage again at the beginning of its next turn, with a saving throw allowed each round to halve damage and end the effect.