I’ve always liked the fan theories that there was more to Badna than just AR’s shenanigans. Like, everybody KNOWS that Badna is a fiction she made up.
But what if he WEREN’T?
What if he were some kind of primordial / Far Realm / Lovecraftian thing, like that ridiculous “demon” in the crummy “City Under the Sand” book? And, locked away in a similar prison to Rajaat’s Hollow, faded from memory, until AR found reference to it, thought it made a grand idea, and ran with it? Except words and thoughts have power, and maybe Badna is waking up?