This building is the evolved verison of the Zerg Hatchery which determines the second stage of Zerg mutation hierarchy.The building can be evolved after the spawning pool is completed.The building cost is 150 mineral and 100 gas.The building improves the life energy from 1250 points to 1800 points.The Lair also includes 3 evolotions these are Ventral Sacs (for transporting overlords), Antennae (sight range),Pneumatized Caraprice (for faster movements).Making lots of Lairs will not be so wise but you can make 2 Lairs to decrease your upgrade time.