Xaltotun

Xaltotun is an evil wizard from Robert E. Howard's stories about Conan the Barbarian. He appears in The Hour of the Dragon as an ancient resurrected wizard, and serves as the main enemy to Conan. Much of the book revolves around Conan's quest to retrieve the Heart of Ahriman in order to defeat the wizard.

Xaltotun may be by far the most dangerous black wizard Conan ever faces, in any of the Conan stories, although the Khitaian sorcerer Yah Chieng in The Return of Conan, who would have beaten Conan except for divine intervention by Crom, may have been of similar power to Xaltotun.

Conan regularly destroys black wizards through brute force and determined frontal attack - in fact, one of his favourite sayings is "A stout blade is a hearty incantation". Xaltotun is different - the one time Conan faces Xaltotun in direct combat, Xaltotun brushes Conan aside as easily as if he were swatting a fly, blasting him unconscious with a flick of his hand.

The raising of Xaltotun from the dead is the act of inadequate men. Orastes, a frustrated seeker of dark knowledge, wishes for a teacher worthy of his ambition. Valerius, Amalric and Tarascus are second rate nobles who seek greater Earthly power, and hope the harebrained schemes of their "pet" black wizard Orastes might advance their quests. None of them hesitate to consider the wider consequences of their acts.

The consequences of Xaltotun's resurrection go far beyond the conquest of a new empire, or a few lessons in the black arts. Orastes finally understands, and repents too late when he realises what he has done.

"When we employed the Heart of Ahriman to bring a dead man back to life," Orastes said abruptly, "we did not weigh the consequences of tampering in the black dust of the past. We thought only of our ambitions, forgetting what ambitions this man might himself have. And we have loosed a demon upon the Earth, a fiend inexplicable to common humanity. I have plumbed deep in evil, but there is a limit to which I, or any man of my race and age, can go. My ancestors were clean men, without any demoniacal taint; it is only I who have sunk into the pits, and I can sin only to the extent of my personal individuality. But behind Xaltotun lie a thousand centuries of black magic and diabolism, an ancient tradition of evil. He is beyond our conception, not only because he is a wizard himself, but also because he is the son of a race of wizards".

...
Wikipedia