The Teth Koros (Imperial Shrikes) were a Romulan Ground Forces elite unit. Members of the Teth Koros were taken from the Tal Shava and enjoyed a fearsome reputation. A single platoon was said to be able to penetrate enemy territory undetected and pin down an entire division with its assassination strikes, lightning assaults and military trickery. (The Dominion War Sourcebook: The Fires of Armageddon)