Mechanism: Construction Tree This page visualizes the hierarchical relationship between base constructions and their prerequisites. Barbed Wire Perimeter Reinforced Steel Bulkhead Spike Trench Scrap Barricade Wall Timber Palisade Wall Armor-Plated Gate Automated Sentry Kill-Zone Floodlights Auto-Bolt Nest Shock Fence Grid Sensor Jammer Grid Counterbattery Array Citadel Aegis Core Extraction Beacon Watchtower Signal Booster (Radar) Beacon Amplifier Threat Scanner Beacon Scrap Workshop Assembly Bench Logistics Uplink Forge Well Hydroponic Patch Preservation Rack Solar Panels Research Lab Specimen Analysis Bay Research Lab II Battery Storage Fuel Refinery