Exterminator

The Exterminator was the Ultimate Dalek Flagship in use during the Time War. After the prototype battleship also named the Exterminator was destroyed above a Dalek Prison Planet by none other than the Doctor, the Dalek Emperor claimed that the ship had been two small and not properly defended, so the new Exterminator (which was to serve as the flagship to the Emperor himself) had to be much bigger, faster and more powerful.

The Daleks created a huge monster of a ship, a massively scaled-up version of the generic Dalek Attack Saucer, which they named the Exterminator-Class. This class of warship was used for many other Dalek Command Saucers but the Exterminator itself was by far the most famous ship of this class. It saw action against the Time Lords on several planets including Gallifrey, and it was severely damaged at the end of the war when the Doctor erased Gallifrey and all the Dalek ships were destroyed.

Falling through time, the Exterminator emerged in the year 100,000 PLF. After secretly taking over Earth through stealth and deception, the Dalek Emperor began harvesting Human flesh to make new, impure Daleks. Eventually going insane, the Emperor named himself the God of all Daleks, and renamed the Exterminator, now calling it the Temple of God. He used it against the pitiful Human defences on Earth in that time, annihilating the unprepared, unequipped and inexperienced Home Fleet with ease. Eventually, the Dalek Fleet was destroyed by the Doctor's companion Rose, who used the power of the Time Vortex itself to burn the Exterminator and the Dalek Emperor with it.

After coming dangerously close to annihilation, the Human race had to seriously rethink its position. In the wake of the Extermintor's attack the Human race tripled its defensive capabilities around their homeworld, and in a way it made the Human Military more aggresive against outsiders and nearly threatened to destabilise the 100,000 year peace that had existed between the races of the Galaxy.