This page is about the Thorn of Slumber Ability in Assassin's Creed Valhalla (AC Valhalla). Read on to learn Book of Knowledge location and how you can get it in the game.
List of Contents
 Thorn of Slumber |
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| Description | An arrow marked with svefnthorn symbol put targets to sleep almost instantly. |
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| Upgrade | On impact, arrows expel a cloud of poison, putting anyone nearby to sleep. |
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Overworld View
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You can find the Book of Knowledge for this ability in the middle tower of Gryttirsand. Climb to the 2nd floor of the tower, break the wood blocking the ladder, and head down to get the Book of Knowledge.
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Overworld View
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Find Dover Fortress on the eastern part of Cent and head there. Find the highest location in the area to see the Book of Knowledge. You can find the Book of Knowledge in a locked building. Get the key on top of the tower, just behind the building where the Book of Knowledge lies. Use it to open the door and get the Book of Knowledge.
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Thorn of Slumber
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 Focus of the Nornir
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 Axe Blizzard
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 Man's Best Friend
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 Piercing Shot
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 Poisonous Powder Trap
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 Raven Distraction
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 Incendiary Powder Trap
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 Mark of Death
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 Ranged Poison Strike
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 Ranged Fire Strike
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 Rush & Bash
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 Blinding Rush
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 Kick of Tyr
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 Vengeance of Thor
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 Feign Death
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 Dive of the Valkyries
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 Harpoon Impalement
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 Rage of Helheim
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 Throwing Axe Fury
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 Poison Strike
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Fire Strike
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Thorn of Slumber Book of Knowledge Location
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