Bursting at The Seams. If slashing or peircing damage reduces the zombie to 0 hit points, it detonates in horrifying fashion: Bile and bone fly outwards covering anything nearby. In a 15 foot radius, all creatures must make a Dexterity Saving Throw DC 12, or take 1d4 peircing damage, 1d4 poison damage. On a failed save, the creature is covered in noxious bile with a strong odor (-10 Stealth bonus for one day or until thoroughly cleaned.

Infectious Corruption. When the zombie critically hits with a bite attack, the target must make a Dexterity or Strength Saving Throw DC 5, on a failed save target contracts the pathogen. On a successful save, nothing happens and for every one following the DC increases by 5. DC resets at the end of combat.

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

Bite. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit:  5 (1d8 +2) piercing damage. Str/Dex Save DC 5 x # of previous bites.