Geralt must help Crach an Craite's children, as they're both competing to become Skellige's new ruler. One of Crach's kids, Hjalmar, has banded with his companions to hunt the ice giant Myrhyff, and what better aid to have in killing a monster than a witcher? Below, we'll share a full walkthrough of The Lord of Undvik in The Witcher 3 so you can save everyone, make the best choices, and bring Hjalmar home.
The quest will ask you to speak with NPCs at The New Port, but you don't need to do this, as you earn nothing from it. Instead, take a boat from a port and sail to Marlin Coast, which we've tagged on the map image above. Once you're here, follow the objective marker, where you'll eventually enter a cutscene with the giant feeding the Sirens.
Head to the eastern side of the ship and climb up via the jump button, where you will be able to speak with Octo, a man who's not exactly the sanest of individuals. Octo will tell you where he last saw Hjalmar, which leads you to your next objective.
Octo will ask for nails, and if you give him some (there are some by the wooden boards north of the boat), then he will give you 200 XP.
Follow the objective, and you'll find Hjalmar's camp, which was attacked, and you can use your witcher senses to reveal two tracks to follow: footprints and a dragged boat. Since this objective diverges, we will start with the footprints.
To begin, you should follow the footsteps, which will take you to nekkers and eventually an Abandoned Village.
Keep following the trail north, and you will find a body; to the left of it, the Hornwall Horn, which can be used to force sirens to drop from the sky. After collecting the items, follow the footprints to find a cave with Ice Trolls, where you can continue tracking the blood trail to find trolls cooking the archer you're looking for.
You can play a game of riddles with the trolls to rescue the archer, or you can just kill them. However, the riddles are the safest path. The trolls will say: "Big he be, steps big he, big he bash." and the answer to the riddle is "A troll." If you get the riddle wrong, the next answer is "Rocks."
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