For people familiar with Disney’s Marvel Cinematic Universe, Dr. Strange in Avengers: Infinity War looked through roughly 14 million futures and only saw one future in which the heroes defeated Thanos, so he specifically drove them to that future knowing that was likely the heroes’ only chance to save the universe from losing 50% of its population.
Where I’m going with this is Sousou no Frieren Episode 30 or Season 2 Episode 2 introduced a character known as the Hero of the South who had been previously namedropped in Season 1. This hero used his future sight to inflict considerable damage to the Demon King’s frontline forces and ultimately defeat Schlacht the Omniscient along with three of the Demon King’s Seven Sages of Destruction in a battle with just him against those elite forces of the Demon King. The reason I say he planned his last stand is that he said that even if Frieren had joined him in that upcoming battle that they still wouldn’t have been able to prevent his death. This shows that the Hero of the South could see the various paths and actions he could follow and take and the future that ensues from them. Therefore, if his power is of that nature, Schlacht’s power may have also been just as powerful, especially given Schlacht was thought to be omniscient.
Furthermore, perhaps futures the Hero of the South and Schlacht had previously seen could change due to the influence of the other party, which would’ve been very frustrating for the both of them, and if that had indeed been the case, both of them may have concluded that the best path forward for both humanity and for demonkind respectively would be to have the other killed. If that is the case, the Hero of the South going into battle on his own against Schlacht and the Demon King’s Seven Sages of Destruction may have been the best-case scenario for both humanity and demonkind with the Demon King eventually being defeated by Himmel’s party, a huge win for humanity, and demonkind surviving complete eradication, a win for the demons as well.
If you thought I had concluded my post with that thought, I haven’t as I still have something to bring up based on a past theory I came up when I was watching the first season of Frieren. Heiter said early into Season 1 before Frieren started her current journey with Fern and Stark that if there was actually a spell to bring back the dead that everybody would know it. Frieren then stated later that humanity learning how to fly was a more recent development by adapting the demonic spell for flight for their own use. So it may be the case that the spell to bring back the dead may just not be known yet, but one day a demon will invent it. We already had one demon, Aura, control the dead with her power, so reviving the dead would be one step up from that with one perhaps needing the original soul to be present for a resurrection to take place which would make Aureole relevant. It’s suspicious that the Demon King’s Castle was also in close proximity to Aureole, the place where people can meet with the souls of the dead, possibly suggesting that the demons themselves may have done research on Aureole.
Perhaps the final arc in Sousou no Frieren will involve a demon inventing a spell to resurrect the dead, allowing for him/her to bring back all the powerful demons of antiquity, including the previous Demon King, necessitating for the true Hero to draw out the Hero’s Sword, which Himmel was unable to do even though it was one of his long-term goals. Even with that power, the true Hero would need a strong group himself, and perhaps Frieren engages the demon that invented the spell that resurrects the dead, and she resurrects Himmel after adapting the spell from that demon to help the true Hero who draws out the Hero’s Sword defeat the demons. Then Frieren and Himmel can live happily ever after if Himmel is still alive after the conflict.
On the other hand, I can see a major criticism of this theory being that true resurrections of the dead would undermine the themes of the story about treasuring the people you care about while they’re still alive, so maybe instead of a demon inventing a spell that truly resurrects the dead, what it’d invent is a spell to reanimate the dead under the user’s control, making those brought back the undead. I guess this would better jive with the themes of Sousou no Frieren’s story. I’m partial to powerful demons of the past being brought back in some way given the Demon King’s Castle and Aureole both being located in Ende, the northernmost part of the continent, and I doubt this proximity the two locations have to each other is a coincidence.


