"Remember your legends. Legends about people missing and returning after a year, only to see the graves of their relatives covered by grass. Are you going to say that they were pure fantasy, things taken from stories? You are wrong. For centuries, people have been kidnapped, snatched by riders, by the Wild Hunt. Abducted, exploited and then thrown away like an empty shell once consumed. But do not expect to be that lucky, Zireael. You will die here, you will not see the graves of your friends."
—Eredin Bréacc Glas (King of the Wild Hunt) to Cirilla Fiona Elen Riannon (Ciri), Lady of the Lake
- Eredin Bréacc Glas, King of The Wild Hunt, 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, and at one point forcibly conscripts Geralt into their ranks, brainwashing him to take part in numerous atrocities. 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 good intentions and make Eredin without doubt the most evil monster in the worlds of The Witcher.
- Vilgefortz of Roggeveen was an ambitious, misogynistic, senior member of the the Chapter of the Gift and the Art, who desired unlimited power and world domination at any cost. Previously a killer and thief before becoming a mage, Vilgefortz aided Emperor Emhyr var Emreis in his quest to find Ciri, and helped Emhyr rise to the throne in exchange for the North once it was taken over. Vilgefortz betrayed his Northern sorcerer comrades to Nilfgaard, facilitating a bloodbath, not even because he switched sides, but to create a distraction for his personal power play and capture Ciri for himself. Vilgefortz brutally beats Geralt, refraining from killing him as a "lecture". Vilgefortz would betray Emhyr by sending him a decoy of Ciri. Believing that Ciri's "blood" as per prophecy refers to her actual blood as opposed to her progeny, he performed vivisection experiments on living women in preparation for extracting Ciri's placenta and using it for her powers. He captures and tortures Yennefer for information; when Ciri offers herself to save Yennefer, he imprisons both anyways. In the final fight against him, Vilgefortz attempts to kill both Geralt and Yennefer, ripping apart and melting their ally Regis.
- Leo Bonhart is a Bounty Hunter who is feared by even the most hardened of criminals. Bonhart accepted contracts regardless of whether his targets were innocents, murdering three witchers because his employers were racist towards mutants. Hired to go after the sixteen-year-old Ciri, Bonhart killed her highwaymen friends, the Rats, then forced her to watch both her lover's death and her friends' having their heads sawn off. Afterwards, Bonhart betrayed his employers, kept Ciri for himself, and traumatized her with his never-ending physical and psychological abuse. Taking her to the Claremont Arena as his latest unwilling participant, Bonhart manipulated his former employer's soldiers into fighting her, resulting in several deaths. Though he agreed to hand Ciri over to Vilgefortz in exchange for getting to watch her vivisection, Bonhart leaves his new comrades to die in Ciri's trap so he could go after her alone. Having become absolutely obsessed with Ciri, Bonhart wanted to duel and kill her himself, then rape her as she lay dying. Bonhart also attempted to rape Ciri's surrogate mother, Yennefer, and suggested to Vilgefortz that she be forced to watch her daughter's artificial insemination. Bonhart relished violence and bloodshed, became a bounty hunter for the joy of killing for a living, and was so evil that a psychic who scanned him compared the sensation to sticking her head into a freshly opened grave.
- Season of Storms: Sorel Albert Amador Degerlund is a mage and an assistant of Grandmaster Ortolan. In order to convince other mages at Risberg that he mastered goetia and unleashed a demon over whom he lost control, Sorel has two ogre-trolls and a hunchback commit massacres. They murder fifty people—including children, among whom a 5-year-old boy who is ripped apart—in very brutal ways. Though at first disgusted, Degerlund participates in killings. Capturing Geralt, Sorel gloats about the massacres and tells him that he would vivisect him for fun. After Geralt's escape, Degerlund is put under house arrest at Risberg. Despite this, Sorel continues to commit murders, killing countless people. He also beheads one of two mages whom he failed to convince that a demon possessed him. Before their final encounter, Geralt finds a body of Degerlund's last victim, a naked 6-year old girl whose stomach is opened in the shape of the letter "Y".
- The Witcher: Azar Javed is an Evil Sorcerer and Mad Scientist all in one and the front man of the Salamandra crime syndicate. Murdering his teachers for objecting to his use of forbidden magic, Azar Javed recruited many humans to Salamandra. Javed used his followers as Cannon Fodder to attack the Witcher home castle Kaer Morhen and steal their secrets on mutation. With this newfound knowledge he conducted cruel experiments on many unfortunate humans, including children, turning them into mindless mutants to create an army for his employer. Azar Javed would also murder a man by infesting him with the eggs of exotic flies, led the Salamandra on vicious anti-human crusades, and murdered a detective who got too close to his trail before taking his identity and trying to manipulate Geralt into doing his bidding.
- Assassins of Kings: Bernard Loredo is the thuggish Commandant of Flotsam who runs the town like his own personal fiefdom, running criminal enterprises and instituting racist policies against nonhumans. When Iorveth's men kill some of Loredo's, Loredo sends out his soldiers to incite riots against the innocent, nonhuman residents of Flotsam, leading to butchery and mass murder of nonhumans in the streets. Eventually, Loredo has the Scoia'tael members and their sympathizers rounded up on a prison barge which he plans on sinking instead of delivering to prison. If Geralt sides with Roche and kills Loredo, the Witcher will discover, despite Loredo's hatred of nonhumans, the Commandant imprisoned, beat and raped an elven woman for a year, eventually impregnating her. The woman was so traumatized by the events that immediately after giving birth she killed herself. Should Geralt choose to side with Iorveth and hijack the prison barge, Loredo responds by spitefully trying to burn down a building full of elven women. If Geralt chooses to save the women rather than kill Loredo, Loredo will succeed in turning traitor and selling out Flotsam to the kingdom of Kaedwen.
- Wild Hunt:
- Cyprian "Whoreson Junior" Wiley is 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 he can rape and butcher at his leisure. When invading his hideout, Geralt discovers the grisly 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 as he pitifully begs for his life.
- "Carnal Sins" sidequest: The Concerned Citizen, aka Hubert Rejk, is a Serial Killer dedicated 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.
- Season 2: The "Voleth Meir"—Deathless Mother—is an ancient being who was trapped by the first Witchers. Feeding off despair and misery, the Mother sows bargains that lead people to death, ruin, and pain while she gluts herself upon it to eventually escape. Bringing about the ambitions of Nilfgaard and also arranging events so the baby daughter of elven sorceress Francesca Findabair is murdered, the Mother also feeds on the pain when Francesca furiously murders every newborn in Redania in vengeance. Possessing Ciri, the Mother murders numerous Witchers before fleeing the sphere and taking her place with the monstrous Wild Hunt.