Jem'Hadar dreadnought carrier

The Jem'Hadar Dreadnought Carrier was a starship design used by the Dominion and were introduced during the Dominion War. These massive vessels were amongst the most powerful vessels used by the Jem'Hadar of which 3,500 served as crew and were double the mass of Galaxy class starships used by the United Federation of Planets. One of the systems present within these craft were Dominion Command Interfaces that allowed a thorough analysis of enemy ship weaknesses that were transmitted to the rest of the fleet. In addition, they had two hanger bays that allowed for the deployment of Jem'hadar fighter class vessels.

Among the first recorded sightings in the Alpha Quadrant was in 2374 when one such vessel was encountered by the crew of the USS Valiant. These Dreadnought Carriers were later used in the war to eliminate enemy outposts as well as provide heavy support at the Battle of Cardassia. (STO website: Dominion Lock Box)