Undead Wolf Alpha

Traits
Keen Hearing and Smell : The wolf has advantage on Wisdom (Perception) checks that rely on hearing or smell.

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 ft. of the creature and the ally isn't incapacitated.

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.

Actions
Bite : Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.

Necrotic Breath (Recharge 5-6) : The wolf exhales a blast of necrotic wind in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking 18 (4d8) necrotic damage on a failed save, or half as much damage on a successful one.