The gist of it is that there was an event that linked the world of men with multiple other worlds( ones where monsters and fantastical creatures live) together. Resulting in the human world being turned upside down overnight and becoming one filled with magic and monsters.
To combat those monsters a special order of fighters was created, The Witchers. They are basically mutants who absorbed mutagens from multiple creatures to become superhuman and able to fight for men. Basically monsters created to combat monsters. They become extremely long lived too but lose their emotions( what makes them human)
And of course since they are seen as monsters their fellow humans discriminate against them.
To combat those monsters a special order of fighters was created, The Witchers. They are basically mutants who absorbed mutagens from multiple creatures to become superhuman and able to fight for men. Basically monsters created to combat monsters. They become extremely long lived too but lose their emotions( what makes them human)
And of course since they are seen as monsters their fellow humans discriminate against them.
