StarCraft: Wings of Liberty
Starcraft II: Heart of the Swarm
Starcraft II: Legacy of the Void
Evolved from the borbu matriarch, and in use by the zerg by 2503, infestors are one of the more insidious new additions to the Swarm.
Infestors possess multiple mouths, and are carried by sturdy legs that secrete a corrosive substance that softens the soil and allows them to burrow in the blink of an eye. Unlike most zerg strains, infestors have the ability to move while burrowed, and can do so at an astonishing speed. Writhing sensory tentacles that extend from the infestor’s jaw serve as a secondary, albeit more powerful, set of eyes and ears by means of thousands of microscopic growths that function as biological transceivers. Further Dominion research on the subject has been slow and fruitless.
Within the Leviathan infestors, the defensive structures of the base creature are more pronounced. The primal zerg utilize infestors as well, but they are often the targets of larger creatures in their own pack. These infestors have evolved thickened plating along their back to protect themselves.
Infestors are used to support hydralisks and roaches on the battlefield. They are used to plant virophages.
Infestors are known to ingest infested marines to use as terror weapons on the battlefield, carrying them to a combat zone. The marines are stored in thick flesh cavities until the infestor regurgitates them to face their former compatriots, or anything else that might pose a threat to the Swarm. These infested marines can pop right out from the ground if the infestor is burrowed.
Fortunately for the Swarm’s enemies, the infestor’s other abilities can only be used above ground. Of them, perhaps the infestor’s most dangerous feature is the neural parasite, a symbiotic creature living within infestors that, when spat, attaches to an enemy and controls its mind for a short period of time. This is inserted through a parasitic stinger, a flexible appendage that is capable of boring through both natural and organic plating. The parasite then is then inserted directly into the target’s central nervous system. The amorphous, multi-mouthed parasite cannot survive for long within a foreign body, but whatever horrific deeds the host carries out while under the influence of the Swarm will leave everlasting scars. Seeing the immense potential of this parasite, the Queen of Blades carried out incubation of new strains capable of living longer outside of their host.
Hardened plates of assimilated mold and fungus offer infestors protection from enemy fire and would-be predators. Upon developing the fungal growth mutation, this armor can also function as a weapon, as the infestor can turn the inner layer of its carapace into a viscous fluid that breaks down matter in seconds and immobilizes anything it comes in contact with. The fluid is sprayed over an area, and any enemy it touches suffers both damage and immobilization. The growth reveals both cloaked and burrowed enemies.