The Needle

The Needle was an object one light-year long and fifty thousand kilometres in diameter, with one end affixed to a black hole. (PROSE: The Infinity Doctors) It eventually became the center of a great empire at the end of the universe. (PROSE: Father Time, COMIC: Miranda)

History
The Needle had been Savar's TARDIS, but was caught by the black hole's gravitational pull and was stretched out when he tried to escape it. (PROSE: The Infinity Doctors) Savar was later retrieved by the Time Lords, eventually having his eyes returned to him as well, (PROSE: Seeing I) but his TARDIS was abandoned. (PROSE: The Infinity Doctors)

Billions of years in the future, most of the people of the universe relocated to the Needle after a great disaster. (PROSE: Father Time) In the Post-War universe, the four surviving elementals created an empire centered around the Needle (COMIC: Miranda) and another Throneworld, and included planets like Endpoint. (PROSE: Hope, COMIC: Miranda) This empire decayed, eventually only ruled by the Emperor until his assassination. (PROSE: Father Time, COMIC: Miranda)

One of the inhabitants of the Needle was Griffin, who interacted with the distant past. Daniel Joyce often worked with powers from the Needle for his Advanced Research Project. (PROSE: Unnatural History)

Miranda Dawkins travelled to the future and became the Empress of the Needle. Many assassination attempts were made on her life by Prefect Ferran. Miranda eventually had a daughter called Zezanne on the Needle. (COMIC: Miranda, PROSE: Sometime Never...)

A few decades before the universe ended, the Needle was almost completely abandoned. The Doctor travelled there in search of Ohm. The end of the universe was a starless, grey void. (PROSE: The Infinity Doctors).