Dalek stealth ship

Dalek stealth ships were used in the Last Great Time War to attack Battle TARDISes.

Characteristics
Their main feature was they could not be detected by any Time Lord monitoring systems until it was far too late; the stealth ships would lie in wait in the Time Vortex until the right moment to strike, and when a TARDIS approached they would appear and they would launch an attack.

They had weapons powerful enough to rip a TARDIS open, exposing the interior dimension. (PROSE: Engines of War)

History
A group of stealth ships attacked a flotilla of Battle TARDISes near the Tantalus Eye. (PROSE: Engines of War)

On another occasion, the Doctor fought Dalek stealth ships off the arm of the Emphidian Reach. (COMIC: Selfie)

In a flashback, the Doctor tried to fix the scanners of a Time Lord force so they could could see the Dalek stealth ships. (AUDIO: Innocence)