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as of Build 320
(Current Build : 332+)

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Cyst grow.gif
"There's green goop everywhere!"
Kharaa.png Kharaa
Team Resources
Marines res.png 1
50 (300)
Abilities and Upgrades
Spread Infestation
Tech Requirements:
Place on valid ground, Must connect to Hive or nearby Cysts
Build Time: 5 seconds
Builds From: Alien Commander
Buy From: Build Tab
Mature Time: 20 seconds


The Cyst is a Kharaa foundational structure created by the Alien Commander. It is a luminescent, pustule-like organic growth with pulsating roots around it.

As the most fragile organ found within any Kharaa habitat, the Cyst can proliferate extremely rapidly. A parent is first grown around a Hive, then daughter Cysts can subsequently branch outward onto horizontal surfaces. When grown, the Cyst spreads bacterial Infestation to encompass nearby terrain, allowing other Kharaa structures to sprout and grow. Cysts depend on Hives for nutrition, and should connection between daughter Cysts be severed, the outermost unconnected Cysts will begin degenerating until death; if left unattended, an entire chain can be eradicated over time. Without Cysts to regenerate the infestation, the nano-grid can slowly eliminate the Bacterium at a cellular level.

Tactical Summary - Cyst

  • Cysts are very important to the Kharaa structure chain.
  • Although inexpensive at 1 Team Resources excessive re-cysting and over cysting (placing cysts over an entire room) can be a waste.
  • Without Cysts alien structures that are not on the infestation will slowly die and not heal or be able to use abilities. Gorge structures are immune to this.
  • Flamethrowers are extremely effective of Cyst clearing!
  • Stepping on a Cyst will expose you to the enemy team momentarily, alternatively Alien Commander's can rupture to expose all marines near the cyst.
  • Killing off large cystchains away from the alien hive will slowly kill all cysts and structures on that chain, example killing 1 cyst near the aliens only hive will cripple whole sides of the map.

  • Cysts take 12 damage per second while they are disconnected from a source like a Hive or an Infested Tunnel.
  • Mist doesn't heal hurt Cysts anymore!

Hivetype Attributes

  • Shift Hive
Celerity: Cysts grow 25% faster
  • Crag Hive
Carapace: Cysts have 25 Armor
  • Shade Hive
Camouflage: Cysts are invisible as long as no Marine is standing nearby, they are not attacked nor the Cysts are disconnected. (Infestation is still visible)


Spread Infestation

Spread Infestation
Cyst idle small.gif
Grows Infestation onto nearby terrain to allow Kharaa structures to sprout from and stay nourished.
  • Infestation recedes quickly if the source is destroyed.
Radius 7 (Tunnel), 7.5 (Cyst), 20 (Hive)
Duration ∞ seconds
Targets Ground, Walls, Props
Requires Cyst, Hive, Tunnel
Infestation growing everywhere


Cyst Chain


Cyst Chain
Cyst slot.gif
Connects to an active Hive through other nearby Cysts to stay healthy.
  • Unconnected Cysts take damage over time until reconnection.
  • Redeploy: destroys oldest Cyst if new Cyst is placed inside its minimum range.
Damage 12 per second
Range 24
Minimum Range 6
Requires Nearby Cyst and active Hive
Chaining Cysts to a Resource Nozzle
Egg spawn buildmenu.gif
Flammable Kharaa structures will take extra damage from fire-based weapons.
Damage Damage x 250%
Type Flame
Targets Bone Wall, Clog, Contamination, Cyst, Egg, Hydra, Web
Requires Cluster Grenade, Flamethrower, Welder
Burning Hydras on the walls


Nutrient mist icon.gif
Most Kharaa structures will mature over time, gaining extra maximum Health and Armor every second until fully matured.
  • Max health/armor and mature time vary between different structures.
  • At 50% maturity, the structure is prefixed as "Grown".
Targets Structure
A newborn Crag slowly maturing