Is a Skellige side quest with suggested level 17, which is obtained after talking to Crache.

It involves helping his daughter, Cerys.

After talking to Crache to get the quest and get more information on what Cerys is doing, head towards Svorlag, to ask Udalryk where Cerys is.

Afterwards, head to the village, and ask the villagers about Cerys. Talk to Bergthora about Cerys. She will tell you to go and find Eiric.

Once you find Eiric, sittin atop a rock, you'll notice that hes being attacked by drowners. After dealing with the drowners, talk with him to find out where Cerys is. He will tell you to look for Cerys in an abandoned home.

You will need to climb up a mountain path to reach the abandoned house. You will eventually come to the abandoned house, and you can use your witcher senses to see Cerys trail. You'll find Cerys and she has passed out. When Cerys wakes, she tells Geralt that she thinks Udalryk's brother Aki's ghost is the one that is haunting Udalryk, and causing his visions, and once the family sword is return to Aki, the haunting will stop.

The next part of the quest will be to find the sword named Brokvar. Head back in the house, and find the cellar key in one of the rooms, once you have the key, enter the cellar. Inside the cellar you will find the sword Brokvar. Return to Cerys after you find the sword.

Next you will head back to Udalryk to explain the plan of giving the Brokvar sword to Aki's bones. After talking with Udalryk, jump in a boat and head to the map marker where Aki's bones are. Once you arrive, dive into the water to search for the location of the bones. You can use witcher senses to find it. If you encounter any Sirens in the water, you can kill them with your crossbow.

After placing the sword on Aki, return to Udalryk. As you get close to Udalryk, you will hear a scream. It turns out that Udalryk tore out one of his eyes, just as the sword was given to Aki's bones. Talk to Udalryk, and Geralt will determine he knows what is haunting Udalryk.

There are two methods to deal with the monster. One is via a trick, the other is to spend a night at the house in with the one afflicted.

If you choose the trick, Cerys will come up with a plan to trick the monster. Do what she says, and this will cause the monster to leave Udalryk, and jump into Geralt, but it was tricked, so it will leave altogether.

This will complete the quest.