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The LongRunningBookSeries ''Literature/{{Discworld}}'' has seen quite a few {{Complete Monster}}s among the LoadsAndLoadsOfCharacters.

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* ''Discworld/WyrdSisters'': Lady Felmet is modeled after LadyMacbeth, only multitudes more sadistic and cruel. The Duchess participated in the overthrow and murder of King Verence I for her husband Leonald to gain the throne for her own benefit and power. Once she inherits her position, she encourages a brutal suppression of peasants and witches alike while using the Fool to spread a propaganda campaign. Revealing herself as a sadist who loves ColdBloodedTorture, Lady Felmet personally engages in inventive torture with captives. When [[NeverMessWithGranny Granny Weatherwax]] removes the mental walls she put up and shows her all the evil in her own mind, she shrugs it off. Unlike most ''Discworld'' villains, the Duchess is fully aware how evil she is. She just doesn't care.
* ''Discworld/{{Hogfather}}'' has [[AxCrazy Jonathan Teatime]]. Lord Downey let him into the Assassin’s Guild out of pity that his parents died only to suspect that [[SelfMadeOrphan he killed them]]. If he is sent to kill someone, he will mercilessly slaughter them, their family, and their pets. He kills any accomplices he has the instant they're not currently useful to him, not excepting Ankh-Morpork's most gifted lock-picker who was an incredibly valuable asset to the Guild. He horrifies even hardened criminals who’ve earned their reputation on murder. The most terrifying thing about him is that he honestly [[ObliviouslyEvil doesn't understand that his sadistic behavior is wrong]]. He sees no difference between having a friendly chat with a man and stabbing him to death
* ''Discworld/TheFifthElephant'': [[OurWerewolvesAreDifferent Wolfgang Von Uberwald]] is despicable. Before the book starts, he murders his little sister, Elsa, because she isn't a bimorphic werewolf and, as such, is [[FantasticRacism "impure"]]. He takes the werewolf tradition of [[HuntingTheMostDangerousGame hunting humans through a forest]] and adds the cruel twist of [[HopeSpot giving them the illusion that they've escaped]] before ripping them to shreds. He doesn't care about all the political power he and his family can gain through the civil unrest; he just likes being sadistic.
* ''Discworld/NightWatch'': Captain Findthee Swing, the leader of [[SecretPolice the Unmentionables]], is the reason his time period is so corrupt. Swing is a TautologicalTemplar who uses people's measurement arbitrarily to decide whether someone is good or bad in his eye. He sees himself and his supporters, such as AxCrazy SerialKiller Carcer Dun, as good and his enemies and victims, like GoodIsNotNice hero Sam Vimes, as evil. When Vimes enters Swing's base, Vimes sees people who have been physically and mentally tortured, one of them is so broken that he does not resist when Vimes [[MercyKill kills him without hesitation]]. Vimes finds Swing about to torture a man tied to a chair, before he comes in to fight Swing to the death.

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