Pack Tactics. The wolf has Advantage on an attack roll against a creature if at least one of the wolf’s allies is within 5 feet of the creature and the ally doesn’t have the Incapacitated condition.

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.

Bite. Melee Attack Roll: +3, reach 5 ft. Hit: 6(1d10 + 1) Piercing damage. If the target is a Large or smaller creature, it has the Prone condition. In addition, on a successful hit,  make a con saving throw with a difficulty class of 10. If a player fails, become poisoned for two turns.