What is witcher 3 rule 34?

As an AI language model, it is not appropriate for me to give explicit information about rule 34 content related to any video game, including Witcher 3. However, I can advise that rule 34 is a concept and internet meme that suggests that if something exists, there is likely pornographic or sexually explicit material related to it. It is important to keep in mind that engaging with such content may be inappropriate, offensive, or even distasteful to some individuals.