Am going to reiterate Geralt, Vilgefortz and other characters from Witcher for second spot in 9-A. Have some feats.
1. Jacques de Aldersberg, through time travel, was able to discern everything that would happen to him in future, essentially giving him at least 30 years worth of precog and prep time. Geralt beat him rather easily.
2. Morenn the Dryad Queen rules over the forest of Brokilon from its center. Brokilon is a country sized dense forest which is home to dryads. Humans, dwarves and elves are normally forbidden from entering, especially if they are men, hostile or woodcutters. Morenn can detect and effortlessly headshot (with archery) tresspassers from her "throne" the moment they set foot into the zone demarcated as forbidden which would effectively be hundreds of kilometres away.
3. Vilgefortz and 21 other mages made a stand on Sodden hill against a 100,000 strong Nilfgaardian army consisting of soldiers and mages, and forced a Nilfgaardian surrender despite having lost 14 of the 22 mages on the hill.
4. Yennefer's mentor, Tissaia de Vries was able to devise magic that could bypass Dimeretium, a material that nullifies magic and is used by normal soldiers to fight against mages. This is something that not even Vilgefortz can do.
5. Eyck of Denesle was a holy man and a monster slayer who slew monsters as a form of charity to the people, as opposed to witchers who charged money for it. He was a pious man who considered witchers and magic heretical and relied purely on his sword skills to defeat the monsters. Also, unlike witchers who had a highly detailed bestiary, composed by generations of their predecessors, to consult regarding how to beat various monsters, and also prepped for them, he relied purely on sword skills and instincts. He fought and slew a wide range of monsters, including haxy ones like basilisks and manticores and powerful ones like cockatrices and dragons.
6. The Order of the Flaming Rose was a Knights Templar organisation initially dedicated to the guarding of the tenets of the Eternal Flame and to help the common man by slaying monsters for free. Every member of this organisation was among the very best soldiers in the whole of the Northern Realms, and also had volunteers from Nilfgaard. Even individual members of the order are expected to successfully slay any monster they may encounter. Geralt can clear fortresses filled with hundreds of these guys.