Pack Tactics.The zergling 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.
Creep Affinity. While on ground covered with creep, the zergling's speed is doubled and it can burrow and unburrow as a bonus action.
Multiattack. The zergling makes two claw attacks.
Claw Attack. Melee Weapon Attack: +7 to hit, reach 5 ft., 1 target. Hit: 11 (2d6 + 4) slashing damage.
Burrow. As an action, the zergling can burrow beneath the ground. While burrowed in this way the zergling is undetectable to a creature without tremor sense. A DC 15 Intelligence (Investigation) can reveal the disturbed earth. A burrowed zergling can unburrow as an action or using it's Ambush reaction.
Enhanced Adrenal Glands. The zergling can take the Dash action as a bonus action.
Ambush. When a burrowed zergling senses a creature within 10 ft. of it it may use its reaction to burst from the ground and leap at the creature and make a single claw attack.
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Description
This horrifying creature is a small and quick moving nightmare. Roughly the size of a dog; these aberrant creatures are covered with an insect-like carapace and have numerous spines and claws protruding from their bodies.
Individually they are not much of a threat, but their tendency to swarm in large numbers combined with a complete lack of regard for their own lives or safety makes them dangerous.