Tiamat Brood

The Tiamat Brood is the largest and most powerful of all the Broods of the Zerg Swarm.

The most important and the most powerful brood of The Swarm, its role is to protect the Zerg Overmind itself. The Tiamat is specialized in tactical space combat and rarely fields any ground creatures. The Tiamat Brood is infamous for breeding the most specialized and advanced Zerg, such as the Hunter Killer Hydralisk strain.

History
While the strikeforce Broods attacked the Terran colonies throughout the Koprulu Sector, the Tiamat Brood remained on Char protecting the Overmind. It did, however, send its specialized Zerg strains to aid the Garm, Surtur, and Jormungand Broods in their attacks on the Terran worlds.

The Tiamat Brood protected Char's planetary Orbit. When General Edmund Duke led attack forces to Char, the Tiamat Brood attacked his fleet as it fled. When the Protoss led a raid on the world and killed Zasz, the Cerebrate of the Garm Brood, Daggoth ordered the destruction of the Garm Brood.

It was not until the invasion of Aiur itself that the Tiamat Brood was used in ground combat. The brood was at the forefront of the attack, along with the Jormungand Brood, the Grendel Brood, and the Baelrog Brood. It invaded the provinces of Antioch and Scion, destroying the Protoss defenders. Parts of the Brood also remained on Char hunting the Protoss who remained there. The Brood itself protected the Overmind but was overwhelmed and it was destroyed.

The Brood remained under the control of Daggoth, and its new Overmind, until Kerrigan destroyed the Overmind. The fate of the Brood is unknown.