Primal guardian

Primal guardians are primal zerg creatures similar to guardians.

Game Unit
Unlike their Swarm counterparts, primal guardians can attack air units.

Heart of the Swarm
Primal guardians appear as enemies on Zerus. They also appear as part of Dehaka's pack during the attack on Korhal.

Co-op Missions
Dehaka can use primal guardians in Co-op Missions.

They have two upgrades available to them. They can evolve to fire an explosive spore at a target that causes area of effect damage. They can also have a buff that increases its attack speed with each consecutive attack, capping at 50%.