As the name would imply, this structure is a flying city. Its appearance is feared by many, since it appears only with the intention of destroying and looting. However it seems to choose its targets carefully, on political grounds. The inhabitants of the city appear to have similar views to the Conspiracy of Equals. When asked who led them, they are said to have replied "Prince Nobody" or "Captain No-one."
As well as flight, the city seems to be capable of submerging itself under the sea, which it does to avoid pursuit. At other times it has flown away over mountain ranges or forests, slowing down land-based pursuit. It does not appear to be able to fly as high as cloud level, or to remain in the air indefinitely.
It is often said that the City will free political prisoners, debtors or slaves, and that some have gone with the city when it escaped. This has led to speculation that the inhabitants of the city may no longer be its original builders. Thus it is not known whether the inhabitants understand how the city flies.