THORNVIK: SKULLS [0510]

First things first, you'll enter Thornvik through the main gate. Instead of going straight, hang a right. You'll hit a big lava pit, but don't worry – there are some stones you can hop across. Use these to get over a fence and into the town proper.

As soon as you're in, take out the archer nearby. Then, make a dash for the stack of crates. Once things calm down, head past one of the main gates. Find a pile of logs to hide behind and take out the group of four Legions that patrol by. If you're stealthy, no one else should notice. SKULL #1 is waiting for you on the other side of those logs. You'll see stairs leading up to the outer wall where more archers hang out. You can run up and take out the one closest to you before heading back down.

From those stairs, stick to the right side of the street, following the wooden fence. When the fence stops, look for a ledge you can jump onto to get to the other side. Follow this path, and you'll find SKULL #2 right in front of a house. Head to the left side of this house and keep going north. Use some rubble for cover to deal with a shielded Legion who's stopped near a tent. After you take him out, run across the bridge – it's to the right of the red portal.

Once you've crossed the bridge, turn left and hug the edge of the cliff. Be careful not to fall into the lava below! Keep following the cliff's edge until you reach the ruins of an old house. SKULL #3 is lying right there amongst the rubble. From where you found the skull, run straight ahead and climb up the stone steps. A few enemies might come to attack you, but just take them out and keep moving.

Now, run north towards a house that's basically just support beams left. Follow the outer wall until you reach a tower. Head towards a cellar door, and if you look behind it, you'll find SKULL #4 tucked away in the corner. Congrats, you should also get an achievement for this one!