Iðunn, also known as Idun or Iduna, was the Norse goddess associated with youth and rejuvenation. According to the Poetic Edda, she was the caretaker of the orchard of the golden apples, fruit which ensured the gods' vigor and immortality.
In Asgard, Havi stumbled across a letter addressed to Iðunn on an altar adorned with apples, saying Tricksters would try to steal her Gift of Youth. Behind the altar, Havi found a small house overlooking a cliff where many apples lay alongside a letter to Loki, indicating that he indeed had stolen the apples.
As the Great Catastrophe approached, Idunn and the other eight Norse Isu uploaded their DNA data into Yggdrasil to be later redistributed into the human gene pool. Millennia later, Idunn was successfully reincarnated as Gull.
Legacy and influence
In the 9th century, the Vikings Eivor Varinsdottir, Dag Nithisson and Tora Auzoux launched a counter-attack against Kjotve the Cruel's forces who were raiding the settlement of Rygjafylke. After fighting off the raiders, Eivor investigated a sound coming from inside a building and was attacked by the tattooed slave Gull, a reincarnation of Iðunn herself. Amidst her wild ramblings, Gull mentioned that she was a "slave to Sökkvabekkr, Sága and Idun's bounty."
Also during this time period, Iðunn had a totem named after her in the popular dice game Orlog. The piece "Idun's Rejuvination" would heal the player's life points by a percentage. The piece was in the possession of a Norse woman in Rygjafylke, who after being defeated gifted the piece to Eivor.
In 2012 Clay Kaczmarek included James Doyle Penrose's painting of Idun and the Apples in a set of puzzles he'd hidden within the Animus for his follower to find. In Clay's puzzle, it was suggested that Iðunn's golden apples were in truth Apples of Eden.
- Assassin's Creed II (Glyphs only)
- Assassin's Creed Valhalla: Song of Glory (mentioned only)
- Assassin's Creed: Valhalla (mentioned only)
- Iðunn on Wikipedia
- Assassin's Creed: Valhalla - Note: Carving of Linked Rings
- Assassin's Creed: Valhalla - Note: Carving of Radiant Orbs
- Assassin's Creed: Valhalla 
- Assassin's Creed: Valhalla – AA_Complete
- Assassin's Creed Valhalla: Song of Glory – Issue #01
- Assassin's Creed: Valhalla
- Assassin's Creed II – Glyph #1: "In The Beginning"