|Raven||133||47||144||110||99||11||Increase attack the further you are from your enemy||Break the glowing rock on the island of the lake at Eurvicscire using Excalibur.|
|A mysterious bow forged from an unknown material, it seems to have been crafted by a civilization prior to ours.|
Behind the scenes
Nearly three months after the November 2020 release of Assassin's Creed: Valhalla, several players stated across social media that a fourth Isu weapon, a bow, was hidden within the game. On January 23, 2021, YouTuber "JorRaptor" was among the first members in the community in sharing a method that would unlock the bow by using a save/load glitch, in which players were to hit a glowing rock located in northern Eurvicscire a few times before saving and reloading until obtaining the weapon. The next day, narrative director Darby McDevitt replied to Jorraptor's tweet that there was a legitimate way to unlock Nodens' Arc.
The Collector's Edition of Valhalla contained all the clues needed obtain the Isu bow, as revealed by the fansite Access the Animus in a YouTube video posted on January 27 describing each of the necessary steps to unlock Nodens' Arc.
Strange symbols were featured on several items in the Collector's Edition, namely, the main box, the soundtrack disk, the CD case, the lithographs, and within the steelbook. To understand their meaning, players needed to translate the Isu script introduced in Valhalla using Layla Hassan's personal files in the game.
- The main box contained a sentence that, once translated, read "The sword is the tool to unlock it." The box also featured the image of Excalibur hidden within the raven tailfeathers, implying that the Sword of Eden was the object needed to complete the task.
- The soundtrack disk featured the words "Hidden Inside", but gave no location or object for players to look in.
- The chemical formulas for silica, periclase, and magnetite—all compounds present in rocks— were written on the back of the CD case.
- When arranged in a specific pattern, the lithographs formed the Isu word for "Now". Astute players could notice that the drawing of a sun was depicted in the center, giving the illusion that the Isu word was hiding it, indirectly hinting at the time of day when the bow became obtainable.
- The steelbook contained the Isu words for "This Lake", the Isu's hexadecimal numeral system, and some Isu numbers. The numeral system was meant to teach players how the Isu wrote their numbers while also showing their equivalent in the binary. If the steelbook was opened to form a right angle, the numbers on the bottom side would create an impromptu 16 x 12 coordinate grid. By drawing it and painting its squares in accordance to their equivalent value in binary, players would reveal the shape of the lake where Nodens' Arc was hidden. Curiously, the lake shape is very similar to the borders of Singapore. In fact, the Ubisoft Singapore studio was in charge of developing some of Valhalla's territories. and one of its developers, Antoine Henry, created the Isu language.
Put together, the sentence read "The sword is the key to unlock it. Hidden inside this lake now." After deciphering the clues, players were encouraged to search for a breakable rock with glowing veins in a Singapore-shaped lake and destroy it with Excalibur at sunset. This lake was, indeed, located in the northern part of Eurvicscire, close to Brunton Turret.
Although all these hints come from the Collector's Edition, it is unknown how Eivor found out about Nodens' Arc in the canon of the game.