Overmind

The Overmind is the collective consciousness that controls all the alien structures in a map and enables aliens to evolve into higher forms. There can only be one Overmind and it must be alive before any other structures can be built. If the Overmind is destroyed then all structures besides Eggs cease to function and every alien loses the ability to upgrade their class until a new Overmind is built. The Overmind has a limited amount of ‘sentience’ which is distributed amongst every other structure built, each having its own cost.

The Overmind deals damage to humans who are close to it, however the amount is negligible. It's weak defense should never be solely relied on for it's defense. The placement of acid tubes behind the Overmind, or around the Overmind can help prevent a Painsaw rush.