Complete Monster/The Witcher

While the saga of The Witcher series runs mostly on grey and gray morality, there are certain exceptions that reach the absolute highest level of depravity imaginable.
 * One of the main themes of The Witcher series is that humans can be the biggest monsters, and in the game, this is true. Geralt's human, elven, and dwarven enemies are far more evil that the mindless monsters that he is contracted to kill as his profession as a Witcher. At times, Geralt struggles with the idea of killing humans, but has no qualms killing those who become worse than monsters. Many characters in this game clearly fall under this trope despite their sometimes good intentioned ends. The worst is Salamandra, the main antagonists of the game who use rape, murder, torture, and treason to further their agenda. They even kidnap children to experiment on them, mutating them and sometimes even just discarding them if they die during experiments (such as Raymond's son). The Order of the Flaming Rose systematically discriminates and persecutes elves and dwarves, even killing innocent women and children. In the end, they massacre nonhumans to provoke them into a bloody revolt in order for the Grandmaster to take power among the chaos. The Scoia'tel nonhuman resistancem howeverm have no problem killing and terrorizing innocent human civilians, in one instance leaving innocent humans to be eaten by the ghouls in a crypt. It's more notable who aren't Complete Monsters in those factions, for example, Siegfried of the Order and Toruviel of the Scoia'tel. In the end, even the main antagonist Jacques De Aldersberg's Karmic Death occurs when Geralt runs him through with the monster killing Silver Sword after he knocks Geralt's Steel Sword (better suited for killing humans) out of his hands. His final words are "That sword is for monsters!"
 * Azar Javed, the leader of Salamandra, not only leads the despicable organization, but also murderers Raymond and takes his place in order to get to Geralt, tricks Shani into giving the prisoner a poisoned drug, and turns the mortally wounded White Rayla into a freakish mutant and sics her on Geralt.
 * The Professor, an underling for Azar Javed, wanted in several kingdoms for 17 murders, gleefully kills Leo, a Witcher in training, in the beginning. He.
 * White Rayla, a potential allied example if you side with the Order for Act V, finds pleasure in killing elves and even to stage a contest to see if she or Geralt can kill more elves. Her worst action (unless you side with the Scoia'tel in Act V) is after she captures the elven commander Toruviel, when she orders her men to torture and rape her repeatedly before she is executed. A female commander using rape as a weapon is even more despicable. It makes it harder to feel bad when she is shot by an arrow in the chest by Scoia'tel leader Yaevinn and then turned into a mutant by Azar Javed.
 * The Reverend, the spiritual leader of Vizima's Outskirts. Seemingly a fair, if slightly rude priest, he is actually a Knight Templar psychopath who had his own pregnant daughter thrown out of the village because she refused to follow the psycho-cult religion he did, forcing her to become a prostitute just to get by, and then, for no reason aside from petty spite and prejudice, tricks his own people into believing that the innocent, kindly mage Abigail is responsible for the recent rise in monster attacks, forming them into a howling lynch mob. And if Geralt (rightfully) prevents the lynching, even after saving the village from the monsters, the Reverend will try to have him killed, again purely out of petty spite. Oh, and he doesn't fight Geralt himself at first. He first sends dozens of innocent villagers that he manipulated to attack. Yes, that's right, he's willing to sacrifice the lives of his own village just because Geralt didn't let him murder an innocent woman.
 * The Witcher 2 continues the trend of corrupt village hicks being this with Bernard Loredo, who can be best described as a greedy and selfish bastard with zero sense of empathy. This guy imprisoned, beat, and raped an elven woman, who was so broken by these tortures that she killed herself as soon as she gave birth. It also turns out that he was willing to sell Flotsam, the town he was dictating over, to the kingdom of Kaedwen, an act which would render him a traitor to the country. The in-game journal even describes him as "the greatest monster in the area."
 * Dmitri, a minor villain from the DLC Troll Trouble, also counts. He and his thugs dig out corpses from local graveyards and put Scoia'tael clothes on them so they can falsely claim that they killed Scoia'tael and get paid. He is also responsible for murdering the Troll of Vergen's wife. The in-game journal even states that comparing him to a hyena would be an insult to the poor animal.
 * King Henselt. This guy is probably the most ruthless and selfish bastard in the whole game. He tries to gain 'respect' among his people by using cruel oppression, most of the time executing non-humans. Not to talk about his brutal attempt to conquer Aedirn where you also see him literally crushing a peaceful priest, who wanted to stop him from massacring a Peace Delegation and raping Saskia, by the head on a stone wall.
 * The Witcher 3: Wild Hunt introduces us to Cyprian "Whoreson Junior" Willey. He's one of the four crime bosses of the free city of Novigrad and runs the casinos, fighting rings, and brothels ,and is widely regarded as the most cruel and sadistic of the city's four crime bosses, and even evokes disgust from these fellow criminals. He has his men dress up as Monster Clowns to torment and intimidate the people of Novigrad, including Ciri, Geralt's adopted daughter. Geralt seeks out Whoreson Junior to get her whereabouts and discovers dark secrets along the way. Cyprian works under the orders of King Radovid to undermine the armistice between the gangs of the city and incite gang wars and mass chaos so that Radovid can invade. Cyprian is paid in prostitutes that he can rape and butcher to his leisure. When invading his hideout, Geralt discovers the grizzly remains strewn about in one of the most nightmarish levels in the game. Ultimately, Geralt discovers Whoreson Junior bathing in the blood of his latest victim, and Geralt, normally rational and stoic, brutally beats him to death even as he pitifully begs for his life.
 * Witcher 3 also contains Hubert Rejk who is likely worse than Whoreson Junior. He is from the "Carnal Sins" sidequest, and he is a fundamentalist Serial Killer who dedicates his life to the cult-like Order of the Eternal Fire and shares their belief that Novigrad is a fallen city. Targeting people he believes have blasphemed against his religion, the Concerned Citizen tortures his victims by removing their eyeballs and placing burning coals within their empty sockets, forcing them to drink formaldehyde, and cutting out their hearts. He believes these horrific murders will act as a form of shock treatment, awakening the city to its decline and causing its populace to repent. He first comes to Geralt's attention after brutally assaulting and nearly murdering his friend, the bard Priscilla. Other victims include a lecherous dwarf, a lecturer on theology who criticized the Church, an old woman who had a crisis of faith after witnessing the church burn people alive, beggars, street walkers, and orphan children. When Geralt gets too close to the truth, the Concerned Citizen frames another for his crimes, and should Geralt fall for the ruse, the killer leaves behind a final body and a mocking note detailing how he's going to move on to a smaller village and continue his work. Should Geralt uncover his true identity, the Concerned Citizen reveals himself to be a Higher Vampire, meaning that he is such a zealot that he willingly supports a religion that wants to completely wipe out him and all his fellow non-humans
 * Morkvarg is one of the most evil and brutal men from Skellige. Ten years prior to the events of the game, he and his crew pillaged and raped coastal villages around Skellige, even those belonging to his own clan. Morvarg even raped and killed pregnant women and girls. At one point, Morvarg was paid by Tjostar the Wise for sparing Tjostar's village located on Rannvaig. Morkvarg took the money and Tjostar, pleased with the deal, called off the watch. Morkvarg and his men returned in the night, slit the villager's throats while they slept and raped the women until dawn.While sailing from Rannvaig, Morkvarg heard owls hooting. He saw it as an ill omen and ordered his men to return to shore. One of his men, Pukke, laughed at Morkvarg who was said to fear nothing but seemed afraid of the gods. Morkvarg slew Pukke but realized that he lost the respect of his men. To prove to his men and himself that he did not fear the gods, Morkvarg and his men sailed for Hindarsfjall. There, they stormed Freya's Garden, smashed the monuments and tied up the priestesses. He then began slitting the throats of the priestesses. Only the Arch priestess Ulve stood in his way. He cut her down along with the other priestesses but with her dying breath, she cursed him. Meanwhile, Einar, one of Morkvarg's men, lost courage when he saw Morkvarg defiling the sacred garden and decided that Morkvarg would need to be stopped. With a wolf tooth talisman he got from his father, he secretly cursed Morkvarg who was turned into a werewolf. After the transformation, Morkvarg turned on his men and killed them, with only Einar escaping the slaughter. While sailing from Rannvaig, Morkvarg heard owls hooting. He saw it as an ill omen and ordered his men to return to shore. One of his men, Pukke, laughed at Morkvarg who was said to fear nothing but seemed afraid of the gods. Morkvarg slew Pukke but realized that he lost the respect of his men. To prove to his men and himself that he did not fear the gods, Morkvarg and his men sailed for Hindarsfjall. There, they stormed Freya's Garden, smashed the monuments and tied up the priestesses. He then began slitting the throats of the priestesses. Only the Arch priestess Ulve stood in his way. He cut her down along with the other priestesses but with her dying breath, she cursed him. Meanwhile, Einar, one of Morkvarg's men, lost courage when he saw Morkvarg defiling the sacred garden and decided that Morkvarg would need to be stopped. With a wolf tooth talisman he got from his father, he secretly cursed Morkvarg who was turned into a werewolf. After the transformation, Morkvarg turned on his men and killed them, with only Einar escaping the slaughter. Not only that, but if you choose to lift his curse, he gleefully declares he's going to resume his old ways.
 * The worst villain is probably King of the Wild Hunt himself. Eredin is the ultimate villain of the Witcher Saga, the Big Bad of the third game, and the Arch-Enemy of Geralt of Rivia. Leader of the Dearg Ruadhri (red riders) cavalry, Eredin has led his armies to the genocide of humans on the Aen Elle elf worlds. Able to cross over into other worlds, Eredin participates in massacres of anyone not sufficiently Aen Elle and takes innocents as slaves, even children, until they are "empty" inside and broken. Eredin murders his king Auberon and attempts to capture Ciri to control her Elder Blood and allow him to invade all the worlds he wishes. Chasing Ciri, the Hunt regularly slaughters all those who might help her. When he encounters Geralt at the end of the third game, Eredin mocks him with how he'll torture Ciri when he no longer needs her. While Eredin wants to escape the coming apocalypse, his sadism, racism, attempted genocide, and cruelty eliminate any sympathy or well intentioned extremism and make Eredin without doubt the most evil monster in the worlds of The Witcher.