Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.
Morningstar. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit:13 (2d8 + 4) bludgeoning damage.
From somewhere in the darkness, a gurgling moan is heard. A form lurches into view, dragging one foot as it raises bloated arms and broken hands. The zombie advances, driven to kill anyone too slow to escape its grasp.