Star Trek Expanded Universe
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The IKS Negh'Var was a Klingon battleship and prototype of the Negh'Var-class. The Negh'Var entered the Klingon Defense Force as the fleet's new flagship.

In early 2372, the Negh'Var, under command of General Martok led a Klingon task force to Deep Space 9 in preparation for the invasion of the Cardassian Union. After the beginning of the conflict the Negh'Var led an attack force back to Deep Space 9 to capture the Cardassian Detapa Council sheltering on the space station. Its powerful disruptors succeeded in penetrating the station's shields and allowing for a boarding action to take place. The attack ultimately failed due to the imminent arrival of Starfleet reinforcements and the Negh'Var retreated with the surviving Klingon warships. (DS9: "The Way of the Warrior")

Ship Recognition Manual, Volume 4: Starships of the Original Series Era[]

The Negh'Var was a unique vessel, built purely to serve as the flagship of the Klingon Empire. (Ship Recognition Manual, Volume 3: Ships of the Klingon Empire)

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