Increases Shields by +100, Defense by +30, Troops by +30 and Detection Range by +30. Shields will be regenerated by 5 per turn and Defense by 1 per turn. Mines will reduce the Structure of enemy ships in the system by 3 per turn. Every turn there is a 5% chance of a Sentry being spawned to protect the system, unless one is already present.
This planet has been prepared for defense by one of the ancient Precursor civilizations. It's brimming with planetary shields, weaponry and sensory equipment to withstand any kind of siege. Everything is still fully functional and surprisingly user friendly.