The classic Klingon cruiser, the D7 Battlecruiser is a stalwart defender of the empire and the basis for one of the most long lived cruiser lineages in history.
A worthy if aging opponent, the D7 was the counterpoint to the Federation Constitution Light Cruiser. The D7 Battlecruiser model is an effective warship design with a balanced weapons loadout. The ship does however does have less powerful shielding systems than those used by the
Federation. Despite some minor flaws, the D7 Battlecruiser was the most powerful warship fielded by the major races of the Alpha and Beta Quadrants for some time. Its effectiveness in battle was well noted by other powers, most notably the Romulan Star Empire
that traded cloaking technology in exchange for several pieces of Klingon technological data, including blueprints of the D7 Battlecruiser.