Hoard. The zombie has advantage on an attack roll against a creature if at least one of the zombie's allies is within 5 feet of the creature and the ally isn't incapacitated.

Corrupted Carrier. When the zombie is reduced to 0 hit points, it explodes, and any creature within 10 feet of it must make a DC 13 Constitution saving throw. On a failed save, the creature takes 7 (2d6) poison damage and if this damage reduces the target to zero hit points they die and rise 1d4 rounds later as a zombie (reworked).

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage and if the damage reduces the target to zero hit points and they die then they rise 1d4 rounds later as a zombie (reworked).