Stregobor is a Kovirian wizard and a master illusionist, as well as a staunch believer in the "the Curse of the Black Sun". He features in the short story The Lesser Evil.
"But Stregobor always looked as, according to every rule and notion, a wizard should look. He was tall, thin and stooping, with enormous bushy grey eyebrows and a long, crooked nose. To top it off, he wore a black, trailing robe with improbably wide sleeves, and wielded a long staff capped with a crystal knob.
He lived in Kovir for most of his life, serving under king Idi, together with the mage Zavist. There he also met Geralt; they didn't part as best friends.
- In the novel