The monitor is a major warship developed during ISW-4. They first ones were created by the Arachnids and first deployed during Operation Pesthouse. They are about twice the size of a superdreadnought and have about 60 to 70% firepower superiority. They were the heaviest ships created until Supermonitors were developed by the Rim Federation during the Fringe Rebellion 60 years later. They were named after the first ironclad warships on old Earth. ("The Shiva Option")
The monitor carrier is a carrier built into a monitor sized hull. They could carry many more fighters, 96 divided into 16 squadrons, and was substantially better armored than fleet or assault carriers.
The escort monitor is a monitor packed with point defense weapons.