Monster Manual, page 316
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 1 sq., one target. Hit: 13 ( 2d8+4 ) bludgeoning damage.