The Shell is an evolution structure unlocked by choosing the Crag tech path; it is built by the Alien Commander. The Shell specializes in Kharaa lifeform defensive evolutions, which are researched by evolving the Shell into a variation of itself (e.g. Carapace Shell). If all specialized Shells are destroyed, the associated evolution cannot be accessed in the Evolve Menu.
- Mature Shell
- Health: 1100
- Armor: 300
- Evolve to Carapace Shell
- Evolve to Regeneration Shell
- Upgrade Cost: 10 Team Resources
- Upgrade Time: 15 seconds
- Description: Evolves the Shell into a Regeneration Shell, unlocking the Regeneration evolution in the Evolve Menu. Regeneration passively increases lifeform health regeneration outside of combat; any damage taken while Regeneration is in effect will reduce health regeneration to normal, and require 2 seconds to trigger Regeneration again.