The Proto-Brain is produced as a result of the Complex. It mounts to the top of the Complex, and provides a boost to the research capabilities of the Complex. It is capable of detaching from the Complex, becoming an independent, mobile unit.
While detached, the Proto-Brain is capable of defending itself through utilising several ground-targeting beams. It additionally boosts the veterancy rates of units that are in the surrounding area during battle by four points. Note that this boost will actually increase the rate of experience acquired by your units, and hence also increase your research points.
Should the Proto-Brain be destroyed, it will reappear at the Proto-Brain complex (for free) and be ready to relaunch in about 20 seconds. This makes it ideal for harassing or distracting your enemies.
There is a glitch of which the Proto-Brain attacks several structures and retreats,sometimes the lasers never stop firing,even when on the Proto-Brain complex.This glitch can be fixed by ordering the Proto-Brain to attack another target.