Vor'cha class

The Vor'cha-class (or Vor'Cha-class) was a type of Klingon Empire starship, an attack cruiser (or battlecruiser) in Klingon Defense Force service in the 24th century. 

The Vor'cha was similarly used as the backbone of the Klingon-Cardassian Alliance fleet in the mirror universe, although the ships were known to have poor targeting performance, frequently chasing after warp shadows. 

History and specifications
The Vor'cha class attack cruisers were created as a more modern type warship that would replace the aging cruisers. The Vor'cha-class provided the Klingon Empire's fleet formations with a vital support and transport element. They were quite successful in the role of long range pursuit making them excellent patrol ships.

Initially developed in the mid-24th century in an attempt to gain superiority over the newer Federation starships that were entering service, they soon became one of the largest and most powerful vessels in service in the Klingon Defense Force. Vor'cha-class vessels were armed with disruptors, heavy disruptors, photon torpedoes, and tractor beams. The forward port also served as a "massive, detachable disruptor." 

Despite the introduction of the larger and more powerful and  in the early 2370s, the Vor'cha class continued to be a powerful vessel and were often used as command ships during the Dominion War and beyond. In 2376, General Talak commanded the Klingon fleet assigned to the Kavrot sector aboard the Vor'cha-class cruiser,. 

Vor'cha-class vessels were also used as command vessels during the battle against the Borg invasion of the Alpha Quadrant of 2376, and later used effectively in the battle against the Cardassian uprising of 2377. 

However, in the alternate reality created by Nero, the class was already in service in the mid-23rd century. The USS Enterprise engaged one in battle during a series of conflicts with the Klingons. Captain Kirk remarked that the ship (much larger than the Enterprise) was smaller than he'd anticipated.