The Na Ra'den-class (known in translation from Klingonaase as the Carrier of Doom-class, alphanumeric designation T12-class) was a Klingon class IX assault starship in Imperial Defense Force service in the 23rd century, becoming active on reference stardate 2/1405. These vessels were produced, about 14 per year, at Fonawl, Iosia and Mustaka, and were the largest assault ships in the Klingon navy at the time of their commission.
This class had a famous action at Mrzicann, when the Klingons invaded a non-aligned world, just outside the Organian Treaty Zone, on reference stardate 2/2003, when 24 of these vessel launched an action force that caught the Mrzicann's 800,000-troop armed forces off guard, leading to a complete surrender in twelve hours, despite the almost 14 to 1 odds in Mrzicann's favor.
The T12 crewed 82, both with space to carry 2,400 troops for deployment. Additionally, the T12 could carry 160,000 metric tons of cargo, rated at 3,200 SCU (standard cargo units). Unloaded, the T12 vessels weighed 126,200 metric tons, measured 300 meters in length, 170 meters in width and 65 meters in height.
The T12's computer was of the ZD-6 type, and the vessels were loaded with 8 standard personnel transporters (6 person), 10 combat deployment transporters (22 person), 4 evacuation transporters (18 person) and 12 cargo transport stages (8 of them small scale, 4 of them large scale). There were also 14 Klingon shuttlecraft standard to these vessels. These vessels were capable, in less than fifteen minutes, of deploying all 2,400 troops, 56 light vehicles and 28 large vehicles could be deployed to ground, making this vessel one of the most respected in known space.
The T12 warp engines were KWE-3 type, rated to cruise at warp seven and max out at warp factor 8. T12 impulse engines were of the KID-2 drive type, and the ships had 8 KD-11 disruptor emitters, with arcs of fire to fore and aft as well as port and starboard. The vessels had no launcher weapons but were defended by KSN model deflector shields. The T12 is noted for having superior sustained warp speeds and superior protection from radiation problems in engineering than others of its general type. One fault noted was the short range of its disruptor fire, the weapons were designed only for close in fire support, making these ships require escort in space-based battles.
By the end of the 23rd century, the T12 was still in production, with over 102 vessels having been built. Over the years, 2 vessels were allocated to Klingon Imperial Marine Training Command, and 12 destroyed. (FASA RPG module: Klingon Ship Recognition Manual)