Invented by Idun, a member of the Æsir branch of Isu, Rings of Eden project an electromagnetic field which deflect magnetic projectiles as well as energy-based weapons discharges. The Rings do not grant the wearer complete immunity, however, and were sometimes used, by the Isu, in conjunction with a shielding device.
In the decades preceding the Great Catastrophe, the Isu attempted to adapt the principles behind the Rings to create a shield that could protect the whole planet from the impending cataclysm. However, they did not have the time or resources to make even a large enough shield to safeguard a single city, and so they abandoned the research for other, more favorable solutions.
During the late 17th century, a Ring came into the possession of the renowned privateer-turned-pirate William Kidd, and its ability to deflect metal or, more specifically, lead musket balls, contributed to folklore stories of his invincibility. Kidd eventually chose to hide his Ring on Oak Island, to keep it safe from Templar forces who sought it. To this end, Kidd created a map that provided clues to the Ring's location, and divided it among four of his former crew members before he was captured by the British and executed.
Years later, the Assassin Connor managed to gather the four pieces of the map from "Peg Leg", who sat near the docks of his ship, and, along with Robert Faulkner, traveled to Oak Island to obtain the Ring. Though both wondered why Kidd protected this "treasure" so carefully, Connor soon realized its power when it threw Faulkner's whiskey flask out of his hand.
- Main article: Hnituðr
Despite taking the form of a golden bracelet forged in seven pieces, the Hnituðr forged by the Isu blacksmith Völund is also considered a Ring of Eden, sharing many of their properties such as magnetic field manipulation. It was kept atop an altar in Völund's forge in the North Sea until the late 9th century, when he offered it to Geirmund Hel-hide, who accepted the gift. The bracelet passed on to Guthrum, who wore it during the battles of Bedwyn and Meretun.
Following Meretun, King Alfred of Wessex negotiated peace with the Vikings and included in his terms that the bracelet had to be given up to be destroyed. Upon uncovering that Guthrum and Alfred had been working together, Geirmund went to confront the former on his deception. The two of them fought, though most of the weapons Geirmund used ended up being useless, apart from a bronze knife, which managed to wound Guthrum in the thigh. Realizing Geirmund had both the will and the means to kill him, Guthrum gave him the bracelet back.
After Geirmund's death, the bracelet disappeared, not being found on him nor in any of his halls.
- In Assassin's Creed III, the artifact is referred to as a "Shard of Eden".
- Subsequent to Connor's acquisition of the Ring, its effects were present while reliving the memories of Haytham Kenway.
- The Ring's effect could also be observed on Desmond Miles after he had relived the memory in which Connor found it.
- The Ring shares many features with the rings of Neodymium magnets that are found in miniature motors, which give off a strong magnetic field.
- Assassin's Creed III (first appearance)
- Assassin's Creed IV: Black Flag (mentioned only)
- Assassin's Creed: Valhalla (mentioned only)
- Assassin's Creed Valhalla: Geirmund's Saga
- Assassin's Creed: Valhalla – A Feast to Remember
- Assassin's Creed III – Modern day
- Assassin's Creed III - Oak Island
- Assassin's Creed IV: Black Flag – Noob's personal files: "Abstergo Industries – Crypto-History: Locations"
- Assassin's Creed Valhalla: Geirmund's Saga – Chapter 8
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- Assassin's Creed Valhalla: Geirmund's Saga – Chapter 16
- Assassin's Creed Valhalla: Geirmund's Saga – Chapter 17
- Assassin's Creed Valhalla: Geirmund's Saga – Chapter 31
- Assassin's Creed Valhalla: Geirmund's Saga – Epilogue