Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 0 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 10 hit point instead.

Stomp. Melee Weapon Attack: +17 to hit, reach 10 ft., one target. Hit: 35 (3d20 + 5) bludgeoning damage.

Punch. Melee Weapon Attack: +17 to hit, reach 10 ft., one target. Hit: 30 (2d20 + 10) bludgeoning damage.

Grab. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 35 (3d20 + 5) bludgeoning damage and the target is restrained. if the zombie titan does a punch attack, the creature is dealt 20 (3d10 + 5) bludgeoning damage.