Melee Weapon Attack: +1 to hit, reach 5 ft., one target. Hit: 1 (1d6 - 2) piercing damage plus 7 (2d6) necrotic damage. The target must succeed on a DC 10 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the creature finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.