The Guild of Thieves, Cutpurses and Allied Trades is a fictional institution on the Discworld created by Terry Pratchett. It is distinguished from Thieves' Guilds in other fantasy universes by being completely legal. Note: Some of the information repeated below was taken from the 2002 Discworld Diary, which had a Thieves' Guild theme, and has not been confirmed in any of the Discworld novels, although Pratchett has confirmed it is "official". The Thieves' Guild was established early in Lord...| Discworld Wiki
In Terry Pratchett's Discworld novels, elves are extradimensional inhuman monsters. Elves on the Discworld are based more on the nastier kind of fairy-folk in British and European folklore than elves as portrayed in most modern (post-Tolkien) fantasy fiction. They are not native to the Disc, but come from a "parasite universe", sometimes called Fairyland. This pocket dimension can latch onto different universes at certain times, allowing the elves (and other fae creatures such as unicorns...| Discworld Wiki