Grunts are bulky humanoid creatures that share some of the physical traits of the Vortigaunt, though they are not the same species. They have multiple red eyes, large arms that end in pincers, and a smaller, gangly third arm extending from just below the chest. Grunts are also equipped with armour plating that is capable of resisting damage from certain weapons. Fire from pistols, rifles and even the tau cannon will simply ricochet off the armour.