https://wiki.project1999.com/Korvik_the_Cursed
Word of warning to anyone looking to camp this or any enchanter looking for his medallion. I spent nearly 6 hours over 2 days killing every wisp in the zone and never seen this guy spawn. Asked for people to keep an eye out for him and had 2 people tell me they also spent hours trying to get him to spawn and he never did.
There are a number of other really old threads about this too. You will make 100x more money just grinding out cash and buy a much better neck piece then the time it would take to find this guy. Unless you happen to run into him by chance do not waste your time trying to camp him.