D9 class

The D9 "Devil" class was a type of battle cruiser fielded by the Klingon Empire during the 23rd century. 

The D9 class was designed as both a front line combat ship and a force delivery ship. It was able to carry 2,000 troop as its standard complement and had additional room for a further 3,000 if need be. Developed in the early 2260s the class was soon eclipsed by the introduction of the and many were uprated or refitted to keep them as viable front line warships.