A Klingon cruiser sent to bring back the renegades Korris, Konmel and Kunivas, who destroyed it before they were found aboard the damaged freighter Batris in 2364.
The IKS T'Acog is a Klingon cruiser mentioned in the episode Heart of Glory. Before the story opens, three Klingon warriors who reject the peace with the Federation seize the Talarian freighter Batris and flee in search of battle.
The T'Acog is sent to bring them home. Korris and his companions lure it close and destroy it, an act that leaves the Batris badly damaged and adrift near the Neutral Zone, where the Enterprise finds it.
Korris at first tells Picard that Ferengi attacked them. The truth comes out when a second Klingon ship, commanded by K'Nera, arrives to take the fugitives into custody and explains what became of the T'Acog.