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.

Foul Breath. a foul stench is emanating from the open gut of the zombie. characters make a con save of DC 13 or be dealt with 1d4 poison damage when they get pithing a 5 foot radius of the gut zombie and if they end their turn inside the radius

Multiattack. Zombie Gut can make one slam and one Gut Bite attack.

Slam. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage.

Gut Bite. melee weapon attack: +3 to hit, reach 5 ft., one target. Hit: 5 (1d8+1) piercing damage. on successful hit target must make a Strength saving throw with a DC 11. on a fail save the target is restrained and can free themself with a strength saving throw of 11 to break free of its grasp.