Tjarnar Mylna Book Of Knowledge is an Assassin’s Creed Valhalla Wealth collectible that teaches you a new ranged ability introduced by Dawn Of Ragnarok expansion. The name of the lethal ability is Split Shot, which shoots ten electrified arrows in a frontal cone. Enemies caught in it are staggered and struck by chain lighting.
The Book Of Knowledge is well hidden in a Raid location, so you can get other goodies (like Silica) while you are at it. You can also summon your crew to help you fight the mobs.
Where To Find the AC Valhalla Tjarnar Mylna Book Of Knowledge Wealth
The Tjarnar Mylna Book Of Knowledge, as you can see below, is in the north of the Svaladal region or northwest of the Sol-ok-Mani Vault (visited in the main quest).

I recommend fast traveling to the northernmost highpoint in the area if you don’t want to waste any time. Approach the Tjarnar Mylna by water and start your Raid. With the help of your crew, kill all the mobs and take all the Silica you can find because the material is quite useful.
After that, set aside your Viking’s raiding ways for a second and focus on the Tjarnar Mylna Wealth located in a giant cave toward the north. Now, let’s see how you actually get the collectible.

How To Get the Tjarnar Mylna Wealth in Svaladal
After you enter the previously mentioned cave, kill all the mobs and head all the way to the back of the cavern. Now go up the stairs on the left and enter the first room you come across.
There, you will find a pedestal with a sphere on it. Aim the light beam emitting from the sphere to the splitter located in the next room (northwest, just like in the screenshot below).

By doing so, the door to the Book Of Knowledge collectible will open. But that’s not all because you must first have to find the door, which is hidden behind a secret passage. You can find the ice-covered passage on the same side of the cave as the room with the pedestal, but in the corner next to the cave’s entrance. You can easily miss it, so look carefully; check the screenshot below to see how it looks exactly.

Now break the ice and collect the Book Of Knowledge in Tjarnar Mylna from the pedestal to learn the Split Shot ability in the Dawn Of Ragnarok DLC.

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