Life Drain

Melee Spell Attack: +4 to hit, reach 5 ft., one creature. _Hit:_ 12 (3d6+2) necrotic damage. The target must succeed on a DC 12 CON save or its HP maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its HP maximum to 0.