The Tiamat Brood was the largest and most powerful of all the broods of the extended Zerg Swarm. It was speculated that the Overmind itself was protected deep within the safety of this living fleet. The most advanced overlords and queens defined the rigid infrastructure of Tiamat and helped to drive the lesser broods to total domination over their enemies. The Tiamat Brood used Cavir as a birthing colony.