The Cognitive Reactor is what converts the knowledge you have mastered in game into energy which you need in game to perform the various activities on the world map, everything from exploration to attacking(using Storms) against enemy cities and oracles. Like all buildings in game the Cognitve Reactor has five levels.
|Level||Max Energy||Max Pop Increase||Shield Size||Shield Strength||Genium Cost|
Up to and including Closed Beta 3.2 the Brain Knowledge Fragment was earned by building the Cognitive Reactor Level 1.
Up to and including Closed Beta 3.2 Max Energy at level 5 was 5000, this was increase to 7000 for Closed Beta 4.0, then decreased again to 6000 for Closed Beta 4.2.