That wasn't even the current Version 1.0 Plot anymore!
The Version 3.0 Expansion Pack was called Shadow of Avalon, and it was also the version in which the Ouroboros Ring Ritual first appeared.
The Fallen Angel's descent occurred outside the main storyline. More precisely, it was a story shown in the Version 3.0 trailer. However, Avalon's Shadow Angel only descended after the Version 3.0 main-story boss—the Fallen Angel that descended upon Stibium—was defeated.
The "someone" who had once been Stibium's puppet but had now become independent and summoned the Shadow Angel was Isabel (Doll).
--This was the core of the Stibium Kingdom's conspiracy, and the reason they dared to attack Avalon directly.
Using their most advanced technological achievements—the combined techniques of golem studies, alchemy, Ritual Studies, and necromancy—they had created a replica of Princess Isabel, making her a Doll loyal to Stibium. She even possessed an independent consciousness and could act autonomously without receiving orders.
Aside from the joints hidden beneath her clothes, she looked exactly like Isabel.
Of course, her personality differed greatly from Isabel's. And because her intelligence was low in autonomous mode, any minister who wasn't an idiot could easily tell that she was merely a Doll.
--But having a Doll as a decoy was enough.
On the surface, Avalon was still ruled by the royal bloodline—even if she wasn't on the Path of Authority, that was still better than having no ruler at all. The ministers who betrayed Avalon and defected to Stibium wouldn't be blamed. Avalonians' hatred also wouldn't be focused entirely on the Stibnite People.
People would only think that Avalon had suffered a defeat and thus signed a treaty that sold out its interests. They wouldn't realize that their New Queen was merely a Stibnite puppet.
Because Isabel became famous in Version 3.0