Riskadh class

The D10-class (known in Klingonese language as Riskadh-class) was a type of Klingon cruiser starships in Imperial Defense Force service around the time of the 23rd century.

Service history
Riskadh-class starships, of the D10A sub-type, were first commissioned into the Klingon Imperial Defense Force on reference stardate 1/9606 (circa the mid-2250s decade). The class was still in production more than twenty years later, when the D10H sub-type was commissioned on reference stardate 2/2009 (circa the late-2270s). 

At some point in the late 23rd century, two ships of this class encountered two Federation Starfleet Hornet-type starships, USS Hornet (NCC-9700) and NCC-9701, near an asteroid belt. (ST calendar: Ships of the Line 2018)

Specifications
Riskadh-class starships featured a wider, bulkier secondary hull than their cousins, but used the same type of nacelle housings and boom section and all except for the D10H sub-type alo used the same command pod. The D10H used the command pod that was used on the frigates instead. 

Riskadh-class starships were constructed in several production runs, with each differing significantly in terms of size and performance. The first batch was called the D10A sub-type, which was followed by the D10D, D10F, D10G, and D10H sub-types. Ships of the D10A sub-type were classified as class VIII cruisers, whereas ships of all following subtypes were classified as class X cruisers.