A parasite universe in Terry Pratchett's Discworld is a universes cut off from the past and future. Like a pond that water cannot flow into or out of they grow stagnant. A parasite universe will latch onto another universe to syphon off time for itself. If this occurs while the borders between universes are weak which is known as "circle time" (when crop circles appear around the Discworld) then lifeforms may travel between these universes. Terence David John Pratchett OBE (known to some fans as Pterry, following the convention he used in his book Pyramids where characters were given names such as Ptraci and Pteppic) is an English fantasy author (born April 28, 1948, in Beaconsfield, Bucks), best known for his Discworld series. ... The Discworld is a series of over 30 novels by Terry Pratchett set on the Discworld. ... The Discworld is the setting for all of Terry Pratchetts Discworld series of novels. ...

The name is a play on parallel universes and parasitism. It has been suggested that this article or section be merged with parallel world. ... Parasitism (in Greek: παρασσυτισμός) is an interaction between two organisms, in which one organism (the parasite) benefits and the other (the host) is harmed. ...

One such universe is Fairyland, the domain of the Queen of the Elves and her sociopathic brethern. The crossing over of the elves into the Discworld is featured in the novels Lords and Ladies and The Wee Free Men. In mythology and in fiction, Faerie (also Faery) is an otherworldly realm, home to the Fae or fairies. ... In Terry Pratchetts Discworld novels elves are extradimensional inhuman monsters. ... Lords and Ladies is a Discworld book by Terry Pratchett. ... The Wee Free Men is the 30th novel in Terry Pratchetts Discworld series. ...

Another is Death's Domain, although it has a permanent, and perhaps symbiotic, connection to the Discworld. Deaths Domain is a fictional dimension in Terry Pratchetts Discworld novels. ...

A similar concept is that of the demiplanes in the Dungeons & Dragons multiverse. See plane (cosmology) for the common meaning of plane as used in cosmology. ... The original Dungeons & Dragons set Dungeons & Dragons (abbreviated as D&D or DnD) is a fantasy role-playing game (RPG) published by Wizards of the Coast. ...