The Witcher season 3 concluded with many questions about the main characters’ fates. As Geralt, Jaskier, and Milva set out to rescue Ciri from Nilfgaard, Ciri has joined up with a group of misfits calling themselves The Rats. Meanwhile, there is unrest among the surviving sorcerers of Aretuza, and Fringillas alliance with the elves comes to an end after Francesca discovers the truth of her babys death. Along with the recasting of Liam Hemsworth as Geralt after Henry Cavills exit, The Witcher season 4 has a lot of story to tell, and will introduce a new character named Regis.

https://screenrant.com/regis-witcher-season-4-laurence-fisburne-character-explained/