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Shell spawn small.gif
"New traits available!"
Kharaa.png Kharaa
Team Resources
Icon team resource neutral.gif 15
600 (700)
150 (200)
Tech Requirements:
Crag Hive, Build on Infestation
Carapace, Regeneration
Build Time: 61.2 (auto-build), 18 (Grow) seconds
Builds From: Alien Commander
Buy From: Advanced Tab
Hotkey: Z
Mature Time: 60 seconds


The Shell is a Kharaa evolution structure unlocked by evolving a Crag Hive. It is an immobile octopus-like organism with a thick shell shielding its fleshy body.

The Shell specializes in defensive evolutions, known as Carapace and Regeneration, which are automatically unlocked when a Shell is created. The defensive evolutions' power increases or decreases with each Shell for a maximum of three times. Defensive evolutions can be purchased in the Evolve Menu, but only one defensive evolution can be active at a time.


Evolution Power

Three Shells clustered together

Evolution Power (Shell)
Shell icon.gifShell 2 icon.gifShell 3 icon.gif
Defensive evolutions' power scale directly with the number of existing Shells.
Max Amount 3 Shells
Targets Carapace, Regeneration
Requires At least 1 Shell

Infestation Dependent

Harvester dying on an uninfested Resource Nozzle

Infestation Dependent
Infestation dependent icon.gif
Most Kharaa structures absorb nutrients by rooting into the Infestation. If the Infestation recedes from underneath a Kharaa structure, it will take damage over time until death or the ground is infested again.
Damage 12 per second
Targets Structures
Requires Off Infestation


A newborn Crag slowly maturing

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

Defensive Evolutions


Carapace trait selected
Carapace boosting Skulk armor

Carapace icon.gif
Increases a lifeform's maximum Armor pool.
  • Each level increases the armor bonus depending on lifeform.
  • Each lifeform gains a different armor bonus per level.
PRes Icon personal resource neutral.png 0 (Skulk), 1 (Gorge), 3 (Lerk), 5 (Fade), 8 (Onos)
Upgrade Time # of traits x 2 seconds
Max Amount 3 Shells
Targets Lifeforms
Requires Shell, Crag Hive, no Regeneration trait selected


Regeneration trait selected
Regeneration healing with green veins effect

Regeneration icon.gif
Increases a lifeform's innate regeneration by a percentage of its maximum health.(Unaffected by higher biomass) Heals the same whether it heals armor or HP making it roughly half as effective when lifeform's armor is depleted.
  • Each level increases the regen rate bonus by 1%
  • Min. regen amount: 6 Health/Armor
  • Max. regen amount: 54 Health/Armor
PRes Icon personal resource neutral.png 0 (Skulk), 1 (Gorge), 3 (Lerk), 5 (Fade), 8 (Onos)
Upgrade Time # of traits x 2 seconds
Healing 4% / 5% / 6% of max health/armor
Interval 2 seconds
Max Amount 3 Shells
Targets Lifeforms
Requires Shell, Crag Hive, no Carapace trait selected