Mobius class

In the mirror universe, the Mobius-class was a Terran temporal destroyer timeship in Imperial Starfleet service during the 29th century. (Star Trek Online official website: Season 6 Dev Blog #29). In 2409, the Tholian Assembly utilized multi-dimensional phasing technology to penetrate the borders of spatial dimensions and the space-time continuum itself, allowing for the retrieval of future starships. This enabled the Lobi Crystal Consortium to sell Mobius-class temporal destroyers to Federation Starfleet (STO website: Temporal Lock Box)

History and specifications
The Mobius-class of ships was in service in the 29th century. The vessels crewed 250 officers and was equipped with a Manheim device. Compared to its regular universe counterpart, the temporal science vessel, the Mobius-class was more geared for combat rather than the protection of the timeline. Mobius-class ships in Federation Starfleet could carry the registry number prefix NCV and the ship name prefix ISS instead of NCC and USS.