Reckless. When the zombie makes a melee weapon attack on its turn, it gains advantage on all melee weapon attack rolls during that turn, but attack rolls against it have advantage until the start of its next turn.

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. It has advantage on this saving throw. On a success, the zombie drops to 1 hit point instead.

Multiattack. The zombie makes three greataxe attacks.

Greataxe. Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 10 (1d12 + 4) slashing damage.

Great Cleave (Recharge 4–6). The zombie makes a greataxe attack against each creature of its choice within reach, and then it can make another greataxe attack against one target of its choice. These attacks have a +2 bonus to damage rolls.