Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 6 (1d6 + 3) bludgeoning damage plus 10 (3d6) necrotic damage, and the dau regains hit points equal to the necrotic damage dealt. The target must succeed on a DC 13 Constitution saving throw or its hit point maximum is reduced by an amount equal to the necrotic damage taken. This reduction lasts until the creature finishes a long rest.