Jadar's battlecruiser

Jadar's battlecruiser was a Klingon battlecruiser starship in service to the Imperial Klingon Defense Force during in the 23rd century, operational in the early 2270s commanded by Jadar.

History
In the 2270s, Jadar's battlecruiser was outfitted with an experimental gravitational field weapon, a device capable of generating a gravitational field comparable to a small quantum singularity.

The USS Enterprise (NCC-1701) was paralyzed by the weapon while en route to Omega IX, with Spock estimating that their vessel would be crushed within four hours. Montgomery Scott fired a quantity of antimatter at the singularity, which destroyed the weapon and heavily damaged Jadar's ship.