So, the Battle of Aeonia. The moment when Malenia and Radahn "locked horns in combat" (in Ranni's words). We know their dispute ended in the devastation of Caelid, but... why did Malenia fight Radahn? And what was she doing in Caelid in the first place? I'd like to share my own answers to those questions.
ELDEN RING SPOILERS BELOW
The way I see it, in the early years of the Shattering war, the demigod Miquella was in the process of either resurrecting his brother Godwyn's soul or granting him a "true death" via a dark ritual involving an Eclipse (a solar eclipse, judging by the Castle Sol sigil and the Eclipse Shotel). But there was a small problem.
His half-brother, General Radahn, was a master of gravity sorcery, a knowledge he had gained while studying in the town of Sellia, in Caelid, in his youth. Allegedly wanting to prevent a meteorite from destroying his beloved alma mater (as per one of the Sword Monuments is Caelid), he managed to combine his knowledge of gravity with his demigod might to indefinitely halt the natural course of the celestial bodies, a feat that earned him the title of "Conqueror of the Stars". And while this exploit had succesfully managed to prevent the destruction of Sellia, Radahn's actions had... other consequences. When the stars stopped moving, the destiny of the Carian Royal family also came to a standstill (whether this was intentional or just a collateral effect is a matter for another post). And, most importantly, with the celestial bodies stopped in place... the Eclipse could never happen.
(I can't help but think about that ghost in Castle Sol that laments that the Eclipse never occured because their "prayers were lacking", tragically oblivious to the truth of the matter.)
Wanting to restart the ritual, Miquella sent Malenia and her knights to Caelid to kill Radahn... but that didn't go according to plan. While his Blade was away, Mohg entered the Haligtree and abducted Miquella in his coccoon. Meanwhile, Malenia struggled to defeat the powerful Radahn, and when he finally managed to mortally wound her, Malenia's rot flower blossomed in Caelid. Radahn was then turned into a witless rot-monster, the whole region was consumed by the scarlet rot, and the brave knight Finlay had to carry Malenia all the way back to the Haligtree, where she slowly recovered from her wounds in a slumber, eternally awaiting her brother's return.
That folks is my understanding of the events surrounding the Battle of Aeonia.
A couple of FAQs to wrap things up:
- If Radahn was preventing the Eclipse from happening with his powers, why doesn't it take place after we kill him in the game? I think we can safely assume that, in Elden Ring's world, a solar eclipse is a particularly rare event (we do not know how the Two Moons Situation works in this planet), and maybe not entirely natural, since it needs to be summoned somehow. Radahn's death makes the eclipse possible again, but whatever Miquella and his followers were doing to bring it forth is no longer being done, so...
- How come there is a night and day cycle in the game before we kill Radahn? Because, even though the moons may not be in motion, the planet is still rotating on its own axis. If the part of the world you're in stops receiving solar light, it gets dark and you can see the moon(s), simple as that.
Does any of this make any sense? I hope so.
As always, please let me know if this has already been theorised by someone else before. I mainly use this blog to vent about my own theories and, while I do follow a few Elden Ring blogs, I don't really keep up-to-date with the latest lore trends.