Evolutions is a "Halo Wars" style mod for Command and Conquer 3: Tiberium Wars that features epic ground and air warfare on a massive scale. Evolutions brings many instruments of war from the Halo universe to life, allowing the player to fight as the Covenant or the UNSC in epic battles based on iconic Halo locales.
The Covenant Prophets Chamber is the main structure of The Covenant empire, and function the same as the UNSC Counter Part. When the Prophets Chamber is destroyed, The Covenant empire is unable to expend there bases until a new Prophets chamber is constructed.