Dalek stealth ship

Dalek stealth ships were used in the Last Great Time War to attack Battle TARDISes. Their main feature was they could not be detected by any Time Lord monitoring system; the stealth ships would lie in wait in the Time Vortex until the right moment to strike. A group of stealth ships attacked a flotilla of Battle TARDIses near the Tantalus Eye. (PROSE: Engines of War)