L'Rell's battle cruiser was a Klingon D7-class battle cruiser that was in service in the mid-23rd century. This ship was commanded by L'Rell. The ship had a crew complement of between thirty and forty House of Mo'Kai warriors.
The cruiser was equipped with a tractor beam, and had at least five Klingon raider auxiliary craft attached.
In 2256, during the first Federation-Klingon War, this ship was used as a prison ship in which captured Federation citizens were interrogated and tortured. Harcourt Fenton Mudd, Gabriel Lorca, and Ash Tyler were held as prisoners aboard this ship. Lorca and Tyler escaped from this ship using a stolen raider. (DIS: "Choose Your Pain")