Defense
Part of the System outputs guide
Defense protects a system against a Navarch's conquest, bombardment and pillage. It stays in the system.

Population and defense
Each whole point of population in a system you own adds 0.15 defense. In a Flash game, population adds no defense. Dominions and autonomous systems never get any.
For example, in a Legacy or Tactic game, 20 population adds 3 defense.

What it does
- More defense lowers a Navarch's chance to conquer, bombard or pillage the system.
- More defense also means more damage to the attacking fleet.
The odds themselves are explained with the Navarch actions.
Buildings that produce defense
| Building | Built on | Effect |
|---|---|---|
| Planetary Shield | Habitable Planets | +4.8 → +24 Defense |
| C.N.D. | Barren Planets | +0.2 → +1 Defense per Defense |
| Interception Tunnels | Barren Planets | +0.4 → +2 Defense per Local Population |
| Assembly Superstructure | Moons and Asteroids | +3 → +15 Defense |
| Constellation of Lures | Moons and Asteroids | +3 → +10 Defense |
| Space Dock | Moons and Asteroids | +2 → +10 Defense |
An effect with an arrow runs from the building's first level to its top level.
A C.N.D. adds a share of the defense the system already has, before percentage bonuses. See How bonuses add up.
Other sources of defense
| Source | Type | Effect |
|---|---|---|
| Centralization of Power | Lex | -25 % Defense |
| War Council | Lex | +25 Defense |
| Syns strength (Synelectic Federation) | Tradition | +10 % Defense |
| Navarch — Defense | Agent skill | +5 Defense |
Defense does nothing against a Siderian's Control. The system's stability defends against it. See dominions.
Defense does nothing against the Erased either. Intelligence defends against them.