In the mirror universe, the IKS Gr'oth was a D7-class, specifically of the K't'inga-class, Klingon battle cruiser starship in Klingon Alliance service in the 23rd century, operational in the early 2290s.
In 2293, on stardate 9587.5, Gr'oth was the mothership of several fighter wings that attacked ISS Excelsior in the Vasilakis Nebula, where that vessel was collecting raw materials for resupply. After the fighters proved ineffective, the Gr'oth itself moved in for the kill, but was chased off by the ISS Renegade. (TOS video game: Shattered Universe)
- The regular universe Gr'oth was mentioned as Koloth's command in DS9 episode: "Trials and Tribble-ations", leading us to believe that the mirror Koloth might've been commanding the counterpart vessel. The gameplay makes it nearly impossible to destroy this vessel, as it only remains in the area for a few seconds before warping out.