- You may be looking for Battle TARDIS.
War TARDISes were created by the Time Lords to fight during the War. (PROSE: The Taking of Planet 5, et al.) These included Type 91s (PROSE: The Book of the War, The Brakespeare Voyage) and Type 94s. (PROSE: The Quantum Archangel)
War TARDISes were reared/born/controlled via a Bull-TARDIS in the time vortex. (PROSE: The Taking of Planet 5) Though not recognisably intelligent, the minimum-intensity biodata in their structures gave them a biological edge, suggesting they were aware of life on their pilots' level. (PROSE: The Book of the War)
The first War TARDISes were designed in the wars against the Great Vampires. Only twelve such TARDISes were manufactured during this time. Due to their nature, War TARDISes were somewhat more sinister than conventional TARDISes. Whereas conventional TARDISes would often assume the characteristics of their owners, War TARDISes would change the personality of their owners. Because they were originally conceived as a very expensive short term measure, the War TARDISes strong sense of self-preservation began to influence their owners. The battle cardinals who were responsible for maintaining the War TARDISes after the war with the vampires was over were influenced by the twelve TARDISes to the point where they always kept the ships ready, keeping on high alert in case there was another battle, even though it contradicted the Time Lords' newly adopted vow of non-interference. The War TARDISes were eventually used once again to help drive back the Krikkitmen threat, during which time one was lost and the other eleven were put back into storage. This lost War TARDIS had, in fact, forseen the possibility of its kind being decommissioned and influenced its owner during the peace talks after the Krikkit War to set in motion a series of event that would lead to a second Krikkit War and the revival of its kin. (PROSE: Doctor Who and the Krikkitmen)
They could map their interior dimensions onto the outer dimensions, making for an imposing sight. (PROSE: The Ancestor Cell) In fact, 91-forms were the first timeships intentionally designed to be indiscreet, appearing as consistently big, bulky, and unapologetic. In orbit, they were often mistaken for arks or flagships of lesser species; however, they more often rooted themselves on planets at ground level, pushing aside buildings and taking the forms of giant cathedral-like embassies for the Great Houses. Some such grounded 91-forms were incapacitated or abandoned and dug out of the group millions of years in the localised future, misidentified by the natives as relics of a lost civilisation or the bones of huge, semi-mechanical monsters. (PROSE: The Book of the War)
Older versions, built during the Dark Times when the Time Lords fought the Great Vampires, were the size of comets and had unstable real world interfaces. One was damaged in the War and became known as the astronomical body Cassandra. (PROSE: So Vile a Sin)
When the Master came under attack by the Divine Host of the Chronovores, the Quantum Archangel altered reality and changed his TARDIS into a "Type 94" WarTARDIS, armed with Klypstrømic warheads, an artron cannon, a vortex lance, and Earthshock bombs. (PROSE: The Quantum Archangel)