Idunn is the final boss of Fire Emblem: The Binding Blade. She is the Demon Dragon who is also known as the Dark Priestess.
Several centuries ago, Idunn's tribe, the Divine Dragons, had remained neutral in the Scouring, a deadly war in which humans and the Dragon brethren both shared the goal of total extermination of the other side. However, when the Dragons started to lose due to their inability to keep up with the numerous and fast breeding humans, the dragons appealed to the Divine Dragons for volunteers to turn into a Demon Dragon and increase their forces with artificially spawned "War Dragons."
When the Divine Dragons refused to do so and disappeared, Idunn stayed behind because she feared the Divine Dragons would go into conflict with the others and was captured. Idunn was made into the Demon Dragon, but when she would not follow the commands given to her, the dragons removed her soul in order to gain control over her. Now an empty shell sworn to obey the leader of the dragons, Idunn started creating war dragons at an incredible rate.
With the endless number of War Dragons, the Dragons now had the advantage over humanity. However, when all hope seemed lost for the humans, the Legendary Heroes of humanity rose to prominence, each wielding a legendary weapon created by combining the best technology and magic.
With this new advantage, humanity began to lead the final push against dragons. This culminated in a final battle in the Dragon Temple, where Idunn resided. In the massive battle, the sheer power of the legendary weapons led to the Ending Winter, which forced the Dragons to become Manaketes.
As human stormed the temple, they killed the Dragon's leader and wiped out almost all of the dragons within the temple. However, when the heroes reached Idunn, they saw only a sad shell of a little girl, staring into space with no orders to obey. The leader of the heroes, Hartmut, felt pity for Idunn, having heard of rumors of her tragic plight, but unwilling to let her potentially endanger humanity, chose to seal her away with the Binding Blade.
About a millennium after her defeat, she is unsealed by Zephiel, Hartmut's descendant and the current King of Bern, and serves him as a vital part in his scheme to bring new order to the world by replacing humanity with the emotionless war dragons.
Before his death, Zephiel ensures Idunn will continue to follow his commands in case of his death and entrusts her protection to Jahn, the last Fire Dragon left on Elibe and the only survivor of the battle at the Dragon's temple.
If the player collects all the Legendary Weapons, Roy will go out to find Idunn after defeating Zephiel. Despite Roy's pleas and insistence that she should not follow the now deceased Zephiel's commands, she refuses to submit and transforms into her dragon form to attack his army.
If Roy deals the final blow with the Binding Blade, Idunn once again survives her battle and is taken to Arcadia; she is seen laughing and playing with Fae, finally showing signs of recovering her soul. If the player fails to get all the Legendary Weapons, the game ends after defeating Zephiel, and Idunn will disappear.
In the past, Idunn, like the other Divine Dragons, insisted on maintaining her neutrality in the Scouring and refused to fight humanity even after becoming a Demon Dragon.
Upon the sealing of her soul, Idunn became a drone who showed little emotion and slavishly followed her current master.
Description: The demon dragon that was feared by all mankind during the Scouring.
- Dark Priestess
- Transformed into a Demon Dragon and sealed during the Scouring. She was awoken by Zephiel and serves him so he may realize his ambition.
| Demonic Breath|
—Idunn's defeat quote in The Binding Blade.
Idunn is illustrated in the trading card game Fire Emblem Cipher with the following cards:
Idun is the Norse goddess of eternal youth, who guards the golden apples of immortality which keep the gods young. In one myth, a giant named Thiazi captured Loki, the Norse trickster god, and only released him on the condition that Loki help him steal Idun's golden apples. Loki obliged, luring Idun away by saying he had found more apples like her magical ones. When the gods began to age and die without Idun to guard their youth, they forced Loki to rescue her again. He disguised himself as an eagle, flew to Thiazi's palace, and there transformed Idun into a nut and carried her back to Asgard, the gods' kingdom. Thiazi pursued but burned his wings on the fires the gods set against him, fell to the ground, and died. Idun was returned to her original form in Asgard.
The name Idun comes from early Norse elements 'ið' meaning 'again' and 'unna' meaning 'to love.'
- Idunn is the first female final boss.
- In cutscenes, Idunn appears as a female Shaman, similar to Sophia. If forced to initiate a battle as a shaman through cheats she uses the generic battle palette and animation for female shamans.
- Idunn is one of the few final bosses in the entire series that is able to move. The others are Duma, Fomortiis, Ashnard, and Garon.
- Like Lyon, Idunn's in-game portrait has light purple hair, while she has silver hair in her official artwork.
- Like Ranulf and Peri, Idunn is heterochromic (it is more noticeable when she is not wearing her hood): her right eye is red and her left eye is green.
- In Heroes, Idunn shares her Japanese voice actress, Risa Taneda, with Palla.
- See main article: Idunn/Gallery.