 | Hormagaunt Brood | Fast infantry | Light melee unit that can overwhelm enemies in large numbers. Can be upgraded with Adrenal Glands which allow them to leap onto enemy targets. |
 | Termagant Brood | Light ranged infantry | Fragile ranged unit that can overwhelm melee enemies en masse. Can be upgraded with Toxin Sacs which grant the Crippling Poison ability. |
 | Warrior Brood | Heavy melee infantry | Melee unit that projects a synapse aura that increases the durability of nearby Tyranid units. Can be upgraded with the Barbed Strangler to suppress enemy infantry. Detects infiltrated units. |
 | Ravener Brood | Assault unit | Fragile, high-damage melee unit that is effective against infantry and capable of burrowing underground. Can be upgraded with the Devourer, a ranged weapon effective against infantry and the Enhanced Muscle Coil to unlock the Burrow ability. |
 | Spore Mines | Explosive unit | Each mine explodes in a cloud of poisonous acidic spores when detonated. |
 | Venom Brood | Anti-vehicle unit | Warrior brood equipped with venom cannons effective vs. vehicles. Can detect infiltrated units. Nearby ranged Tyranids will also receive damage bonuses. |
 | Zoanthrope | Artillery unit | Slow, fragile artillery unit. Comes with the Focused Warp Blast and the Warp Field abilities. Projects a synapse aura that increases the health regeneration of nearby units. |
 | Tyrant Guard | Monstrous creature | A large, durable melee unit that moves faster in synapse. Can use the Shieldwall ability, which regenerates health and reduces incoming damage. |
 | Genestealer Brood | Elite melee infantry | An elite melee unit that infiltrates after staying still for enough time. Adrenal Rush ability grants increased speed, lifesteal and increased damage. |
 | Lictor | Assassin unit | Elite assassin unit that comes with the Infiltrate ability and the deadly flesh hooks attack. Detects infiltrated units. |
 | Carnifex | Monstrous creature | A living engine of destruction that is impervious to small arms fire. Can be upgraded to have Thornback Armor, Barbed Strangler, or Venom Cannon. |