Ciri teleports herself and Geralt there from the Isle of Mists at the end of the kaer morhen quest. After a joyful reunion between Ciri and her mentors growing up, it is time to prepare the kaer morhen for the battle to come. Follow Yennefer and Triss to the main hall to organize your group of warriors. You can recruit Zoltan and Ermion without doing a quest for them, just go see them!
TrissLetho, and Kiera will be at Kaer Morhen automatically if you did their respective quests and told kaer morhen to go there.
Make sure to visit Crach in Skellige too. He gives you a powerful blade.
Full Kaer morhen for all the details. Kaer morhen inside, the preparations are made. You have two key decisions that affect the battle. If you choose the potionsyou receive Superior Swallow and Thunderbolt. The second choice is to either patch up the breach or dig out the armory.
Patching up the wall leads to fewer waves of the Hunt later in the battle. Clearing out the armory gives all Witchers shiny silver swords. Make the decisions and motivate the group. When Lambert returns with your requested gear or repairs, all you need to do is leave the main hall to begin the battle.
There are a total of five parts to this epic battle. Three with Geralt and two with Ciri. Geralt, Lambert, and Kaer morhen if you invited him ambush the Hunt with invisibility tokens from Yennefer. There are three portals that you must shut kaer morhen. Go from left to right, since the left portal is closest. You can destroy a portal in one of two ways. Either use a Dimeritium Bomb from Kaer morhen or use Yrden to destroy them. The portals are protected by two hounds and one or two warriors of the Wild Hunt.
Sneak in as close kaer morhen possible and toss a bomb, then eliminate the guards from that portal. Use Igni to keep your distance and finish them off. Do the same for the middle portal. When you kaer morhen the third portal, sneak in and destroy it kaer morhen being seen, if you can. Once you get rid of the portal, a cutscene will begin shortly after.
Ciri rushes out of the safety of the keep. She notices the signal and goes off to help Triss. Run to her and fight off the Hunt. Use Blink and the pendant Triss gave you if you are in a pinch. When the five or six hounds and two or three warriors kaer morhen eliminated, Triss helps out Geralt and crew.
Cutting kaer morhen to Geralt, fire is literally raining down. Hop on Roach and avoid the fireballs as you race back kaer morhen Kaer Morhen. When you enter the gate with Lambert and LethoVesemir is in a pinch. Help him close kaer morhen portal and a gate by running up to the wall and flipping the switch.
Run back toward the heart of the keep, climb the stairs and go to the right.The Witcher 3 The Battle Of Kaer Morhen (full crew)
Kaer morhen will see Vesemir fighting off a warrior. Hop down off the wall and finish off the warriors that Vesemir, Lambert and Letho are facing. When they are down, run into the courtyard with everyone else. Fight off five warriors and hounds in the courtyard, saving Lambert in the process.
Vesemir will call for a retreat beyond the door with Eskel. Fight up the stairs, shutting every portal you see and slaying the Hunt along the way. Eskel is in trouble. Ciri needs to help him out. Back in control of Ciri, swoop in to save Eskel after his kaer morhen with Caranthir.
Fight off four warriors. Pick up Eskel and move kaer morhen to the courtyard to open the door. Fight off hounds and warriors by the gate, roughly four enemies total. When they are all down, twist the wooden wheel to kaer morhen the door for everyone. The last kaer morhen of the battle is upon you.
Back in control of Geralt, you need to focus on closing portals.
Run past enemies and close the portals. If kaer morhen run out of Dimeritium Bombsuse Yrden to close them. There are kaer morhen three portals at a time. Destroy them and then fight the Hunt. Listen out for Eskel to call for help. Run to stop the next wave, closing portals and fighting warriors. Finally, Triss will call for help down by kaer morhen door. Go back down and fight off this last wave.
Halfway through the fight, the final cutscene will trigger. The Hunt has been stopped, but as they say, the battle may be won, but the war is far from over.