The War Beast was the Klingon Empire's first battlecruiser and entered service in the middle of the Terran 21st century.
The designation W4 denotes that it was the 4th warship produced by the Klingons. At that time all warship prooduction was undertaken on Q'uonos. Many of the familiar shipyards, such as the D'rel shipyards, didn't exist.
The War Beast was an over ambitious project for the level of Warp Drive technology possessed by the Klingons at that time. It was both underpowered and over gunned with poor sublight and Warp speed characteristics. However it satisfied the Klingon's naturally over inflated ego to be able to field a very big warship at that time in their history, and this seems to have been the primary goal.
Warp drive was provided by a pair of Fusion powered Warp Drive nachelles which gave a maximum speed of just over Warp 2. Impulse power was provided by command section and secondary hull mounted engines.
The forward command hull contained the crew accommodation, shuttle bay, two short ranged Disrupter barbettes and missile launcher tubes. It could seperate from the secondary hull and move at 1/30th of light speed under its own power during an emergency.
The secondary hull contains the massive Fusion powerplant for the Warp Drive, the medium range Disrupter turrets and the fuel tanks which were housed in the wings.
In total the War Beast carried eight Disrupters, four short ranged in barbettes and four medium ranged in turrets. Four missile launcher tubes were also carried to provide long range bombardment capability.
During the expansion years of the Klingon Empire, the War Beast and its four sister ships, helped in the conquest of several star systems. Against races that did not possess Warp Drive or those at a similar technological level as the Klingons, the War Beast proved decisive.
Approximately 20 years after launch, all of the War Beast class received upgrades in propulsion. All were refitted with new twin coil Fusion powered Warp nachelles in the hope of increasing performance. However this only increased the maximum speed to warp 2.4 though it did increase the available power levels for combat.
All five War Beasts were lost in futile actions against the Romulans when the Klingons attempted to annex territory from a falsely perceived weakened Romulan Star Empire directly after the Earth - Romulan War.