Arkannis Major

Arkannis Major, also known as Colony world 4378976.Delta-Four, was a planet located far away from Earth. It was colonised by humans before the 30th century. Its inhabitants knew it by many names, such as Journey's End, Discovery, and Pioneer. Due to micro-organisms in its atmosphere, anyone living on the planet started to believe things they imagined (as well as fictional works) were real, resulting in the outlawing of fiction in the planet's only city in the 30th century. (NSA: The Stealers of Dreams)