Infection. When a creature is poisoned by a Zomboid, the poison condition does not end until either it is cured or an hour has passed. If an hour passes and the poisoned condition is not cured, the Poisoned Creature turns into a Zomboid. When turned, a creature is fully aware and conscious, but cannot control itself. A creature that is turned in this way retains its Strength, Dexterity and Constitution scores, as well as its Armor class, Hit Points and Class Features. There is no cure for a Zomboid Infection once a creature has turned. 

Supernatural Sustenance. Every 1 minute if a Zomboid is reduced to 0 hit points but its head is still intact and attached to its torso, it is healed to its hit point maximum. Additionally, it does not require sleep, food or water. Though it will still seek out humanoids to feast on as if it is starving. A Zomboid that is missing both of its arms or legs loses its Overwhelm action.  

Overwhelm. Melee weapon attack: +5 to hit, reach 5 ft, one target. Hit: 5 (1d6 + 1) bludgeoning damage, and the target is Grappled. If a Zomboid targets a creature that is already grappled by another Zomboid with this attack, it makes the attack with Advantage. Additionally, if a Zomboid hits a creature that is grappled by at least one instance of this attack, the target must make a Strength saving throw (DC equals 8, plus 5 for each additional Zomboid grappling the target) or be knocked prone. 

Feed. Melee weapon attack: +5 to hit, reach 5 ft, one prone target that the Zomboid is grappling. Hit: 7 (2d6 + 1, plus an additional 1d6 + 1 per Zomboid that is grappling the target) piercing damage. On a hit, each Zomboid that is grappling the target heals for an amount equal to the damage dealt, and the target becomes Poisoned. 

Ankle Bite. Melee weapon attack: +5 to hit, reach 5 ft, one target. Hit: 3 (1d4 + 1) piercing damage. The Zomboid must be prone in order to make this attack, and it does not suffer disadvantage on its attack roll. On a hit, the Zomboid heals for half the damage dealt (round up) and the target becomes Poisoned. The target also has its movement halved until the end of its next turn, during this time it also has disadvantage on any saving throw made to avoid being knocked prone.

Play Dead: Whenever the Zomboid takes damage from any source, it can take a free action to go prone and play dead. While playing dead all outside inspections, magical or otherwise, reveal the Zomboid to be dead. 

Lunge. As a reaction when a creature ends its turn within 5 feet of the Zomboid, or moves within 5 feet of the Zomboid, while it is playing dead, the Zomboid can make an Ankle Bite attack with advantage.