ISS Fortuna (NC-47421)

In the mirror universe, the ISS Fortuna (NC-47421) was a Terran Empire starship, a command battlecruiser in Imperial Starfleet service in the 25th century. 

History
In the year 2409, the Fortunaled a flotilla assembled by Captain $𝜇$ into the Badlands. When an Allied ship from the primary universe entered the mirror universe through an interdimensional portal, the other ships engaged it but were defeated. That forced Leeta to intercede, but the Fortuna suffered damage and was forced to retreat. The Allied ship proceeded on its course to $𝜇$ unhindered.