During the Second Dalek War, it was the pride of the fleet. It served as the flagship of the Dalek Fleet and was under the command of Dalek X, along with containing a standard crew of 500 Daleks plus 10 ranking Commanders. The ship had 10 anti-gravity impeller engines. The neutonic reactor at the ship's centre supplied vast arrays of particle beam weapons, missiles and energy shield repulsors.
After tricking Dalek X into taking him to Hurala, the Tenth Doctor rigged Lodestar station's astronic fuel reserves to explode. The blast, visible from seven light years away, struck the Exterminator and ruptured and disemboweled the ship, leaving fire spurting from its rim. The Exterminator crashed into the chasm created by the blast, sending off a second chain reaction that destroyed its support ships. The loss of the Exterminator and Dalek X knocked the Dalek war effort back and put the Dalek fleet into disarray, leading to the end of the Second Dalek War. (PROSE: Prisoner of the Daleks)