 250px|"The Nix as a brook horse" by Theodor Kittelsen: folklore transformed into a fantasy world A fantasy world is an author-conceived world created in fictional media, such as literature, film or games. Typical fantasy worlds involve magic or magical abilities, nonexistent technologyBrian Attebery, The Fantasy Tradition in American Literature, pp. 166–7,  and sometimes, either a historical or futuristic theme. Some worlds may be a parallel world connected to Earth via magical portals or items (like Narnia); an imaginary universe hidden within ours (like Wizarding world); a fictional Earth set in the remote past or future (like Middle-earth); an alternative version of our History (like Lyra's world); or an entirely independent world set in another part of the universe (like the Star Wars Galaxy).John Grant and John Clute, The Encyclopedia of Fantasy, "Imaginary lands", pp. 495–5 Role-playing games Dungeons & Dragons, the first major role-playing game, has created several detailed and commercially successful fantasy worlds (called "campaign settings"), with established characters, locations, histories, and sociologies. The Forgotten Realms is perhaps the most extensively developed of these worlds. These elements of detail can be a large part of what attracts people to RPGs. Poul Anderson, "On Thud and Blunder" Diana Wynne Jones: The Tough Guide To Fantasyland  explains and parodies the common features of a standard fantasy world Patricia C. Wrede, "Fantasy Worldbuilding Questions"
File:Theodor Kittelsen - Nøkken som hvit hest.jpg| 250px|"The in American Literature, pp. 166–7, </ref> and sometimes, either a historical or futuristic theme. Some worlds may be a parallel world connected to Earth via magical portals or items (like Narnia); an imaginary universe hidden within ours (like Wizarding world); a fictional Earth set in the remote past or future (like Middle-earth); an alternative version of our History (like Lyra's world); or an entirely independent world set in another part of the universe (like the Star Wars Galaxy).John Grant and John Clute, The Encyclopedia of Fantasy, "Imaginary lands", pp. 495–5 Role-playing gamesDungeons & Dragons, the first major role-playing game, has created several detailed and commercially successful fantasy worlds (called "campaign settings"), with established characters, locations, histories, and sociologies. The Forgotten Realms is perhaps the most extensively developed of these worlds. These elements of detail can be a large part of what attracts people to RPGs. Poul Anderson, "On Thud and Blunder" Diana Wynne Jones: The Tough Guide To Fantasyland '' explains and parodies the common features of a standard fantasy world Patricia C. Wrede, "Fantasy Worldbuilding Questions"
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