In August 2382, the Terrinex and the Kytonis were operating out of the Inasa system in support of the Dekkona. They participated in an attempt by Dekkona Commander Marius to lure the Federation starship USS Aventine from the Breen-Federation border by transmitting a false distress signal from the civilian freighter SS Tullahoma. When the Aventine reached the transmission origin near the Black Cluster, all three warbirds decloaked, and Commander Marius issued an ultimatum to Aventine Captain Ezri Dax to surrender her ship or be destroyed. The Terrinex and her sister ships were caught unprepared when three Qang-class heavy cruisers and two Negh'Var-class battleships also decloaked, surrounding the Romulan fleet and allowing the Aventine to return to her mission along the Breen border. (ST -