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Thargoid Spire site

Thargoid Spire sites are huge organic structures of Thargoid origin, grown on planet surfaces. They are approximately 6 km tall.
Following the invasions of human occupied systems a number of Thargoid Spire sites were discovered on worlds with thin ammonia atmospheres, with the first site spotted on 16 October 3309. They appeared to act as vast refineries and contaminating these proved critical to undermining the defenses of the eight Thargoid Titan systems.
After the defeat of the Thargoids all known Thargoid Spire sites have entered a shutdown state, the production facilities are dormant and no hostile craft can be found in the area.