A wall around the outpost. Boosts your defense.
Support a defending army with fortification bonuses. It complements a garrison; compare the enemy's attack category with your defenders instead of relying on the wall alone.
To establish this building, you need 🏛️ Main Building level 1; ⚔️ Barracks level 1.
For later upgrades, the Main Building must also reach the target level. The level table shows the resource and time investment before bonuses.
Direct building dependencies: 🎯 Defensive Turret (level 1 required here).
The building definition has no direct structural or active power upkeep. Check the powered extractors, crafting and recruitment that support its use when planning the wider grid.
📸 Screenshot wanted: the Perimeter Shield detail panel in a colony (level, upgrade cost and its main controls visible). If the building has a Race name, one shot per Race is ideal.
| Stat | Value |
|---|---|
| Max level | 20 |
| Level 1 cost | 130 Silicates, 170 Metals |
| Cost growth per level | ×1.28 |
| Base build time | 7 s |
| Build time exponent | 2.2 |
| Max per outpost | 1 |
Base numbers, before any research, Race, tile or build-speed bonus.
| Level | Cost to reach | Build time |
|---|---|---|
| 1 | 130 Silicates, 170 Metals | 53s |
| 2 | 165 Silicates, 220 Metals | 1m 39s |
| 3 | 215 Silicates, 280 Metals | 2m 42s |
| 4 | 275 Silicates, 355 Metals | 4m 01s |
| 5 | 350 Silicates, 455 Metals | 5m 39s |
| 6 | 445 Silicates, 585 Metals | 7m 35s |
| 7 | 570 Silicates, 750 Metals | 9m 49s |
| 8 | 730 Silicates, 955 Metals | 12m 23s |
| 9 | 935 Silicates, 1225 Metals | 15m 16s |
| 10 | 1200 Silicates, 1570 Metals | 18m 29s |
| 11 | 1535 Silicates, 2005 Metals | 22m 03s |
| 12 | 1965 Silicates, 2570 Metals | 25m 57s |
| 13 | 2515 Silicates, 3290 Metals | 30m 13s |
| 14 | 3220 Silicates, 4210 Metals | 34m 49s |
| 15 | 4120 Silicates, 5390 Metals | 39m 47s |
| 16 | 5275 Silicates, 6895 Metals | 45m 07s |
| 17 | 6750 Silicates, 8825 Metals | 50m 49s |
| 18 | 8640 Silicates, 11300 Metals | 56m 53s |
| 19 | 11060 Silicates, 14460 Metals | 1h 03m |
| 20 | 14155 Silicates, 18510 Metals | 1h 10m |
Key: perimeter_shield