You'll get this quest after completing the "Ugly Baby" quest. If you want to complete it successfully, you have to finish it before you travel to the Isle of Mists.
Geralt realized the fight against Eredin and his soldiers would most likely be the most difficult challenge he had ever faced. In addition, the stakes were higher than ever before - this time he was not fighting for his own life, but for that of Ciri and, by extension, the entire world. Since extraordinary circumstances call for extraordinary measures, the witcher decided to swallow his pride and go to the emperor of Nilfgaard for help.
