Built during the 2360's, the Negh'Var was designed for unparalleled protection and firepower; her sheer size was intended to allow her to carry an armament powerful enough to overwhelm any opponent, present or future. She emerged from the shipyards as the largest vessel ever built by the Klingon Navy, at over twenty two hundred feet long.

The main armament of the Negh'Var comprises a pair of huge disruptor cannon, the largest such weapons ever built. Although they are the most powerful mobile weapons on any alpha quadrant ship, the weapons are able to fire over a very limited arc. Since the Negh'Var herself is not exactly a manoeuvrable ship, the intention of these weapons seems to be to deal with the heavy shielding associated with large space installations, fixed defensive systems and planetary arrays. Engaging other vessels falls to the 18 Mark 12 disruptor cannon distributed across the hull; while these are only a fraction as powerful as the Mark 18 weapons, they are at least equal in firepower to the Starfleet Type X phaser array and hence among the most powerful in service.

The Negh'Var is equally well equipped for defensive operations. The shield systems are based on those used in the defence platforms protecting the Klingon home world, and the hull itself is constructed of a high density armour plate. As with recent Federation designs, the structural integrity field is rated at more than triple the normal standard, allowing it to considerably reinforce the armoured hull and provide a powerful backup protection.

Although its primary role is in destroying fixed defences and enemy vessels, the Negh'Var apparently has a considerable secondary role in landing and supporting troops. Some ten thousand can be carried on board, and the ship has over thirty personnel transporters and large numbers of landing craft to carry them. She can carry supplies for up to ten days of surface fighting, and if necessary can support the ground forces by both orbital bombardment and warhead transporting.

Launched in 2371, the Negh'Var is currently serving as the Flagship of the Klingon fleet. Her first combat action was during the Klingon-Cardassian war, where she was responsible for destroying six Cardassian vessels, twenty three defence platforms and overwhelming the planetary shields on eight Cardassian worlds. She thereafter fought an action at Deep Space Nine, where she was able to breach the stations shields for long enough to land several hundred troops. She has since seen considerable success during the Dominion war, adding to her fearsome reputation.

• D758 IKS Negh'Var