The giant orange ship is The Terigon, it was built originally as a super carrier, mid way through development it was fitted with facilities to support a city within.
This was a turning point in the Dragon vs Human war that had been going on for centuries. The archangel taking down the Terigon and forcing its power facilities to overload and kinda just poof away.
lleft ( https://www.furaffinity.net/view/44945975/ ) designed and had this ship built in under 10 years
The MSSCAR Terigon is 180 miles long 90 miles tall 60 mile in width.

A very special thanks to:  Yantiskra for making this for me :D