DESCENDANTS LORE (the biggest crossover ever)

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DESCENDANTS LORE (the biggest crossover ever)
Why, Just Why?
I love Descendants, but I think it’s one of a few franchises that could really do with a prequel. I want to know what happened that necessitated (or, that the heroes would argue necessitated) the creation of the isle of the Lost.
I can sort of see an idea of a villain team up in the Underworld to wreak havoc on the heroes - Hades sure wouldn’t mind as long as he gets Olympus in the end. And Jafar’s sister Nasira could raise the dead (and she seems to exist in Descendants, as Jafar has a niece named Jade in the books), so who's to say someone else wouldn’t? There’s also, in the theme park shows, an Evil Fairy Godfather who sides with the villains and wants them to succeed. Perhaps he had something to do with whatever happened to cause the Isle’s creation. If he’s the Evil counterpart to the Fairy Godmother, he’s probably strong enough to raise the dead as well.
So, fine, the heroes aren’t safe even with their villains dead. But I don’t think there’s really enough to cause the Isle. The heroes who had their villains die seemed perfectly happy to let them be dead and move on. INCLUDING Belle and Adam. They didn’t waste their celebration going ‘Oh, are we REALLY safe with Gaston dead?’ They were just happy he was gone.
I’m guessing whatever happened had to be a doozy too, since it caused all the heroic kingdoms to band together into Auradon and elect Adam the High King. And they were perfectly happy to maintain that alliance for 20 years.
So, for the purposes of blog backstory, I’m going to say the villains were planning a comeback and reign of terror in the Underworld, with the help of their Evil Fairy Godfather and a few still living villains and henchmen. The plot got underway, with the villains nearly raised from the dead, when the heroes foiled them by banding together (possibly taking down each other’s enemies in exchange for the same courtesy). Adam was the leader during the escapade to prevent the plot and so in the following diplomatic consolidation of the alliance, he was a shoe in for the election of High King. And, in order to prevent another attack from beyond the grave, the Isle was created. The heroes figured it was a decent halfway point between letting them stay a threat in the Underworld or bringing them back and having to constantly monitor them in prison. They would create an Isle where the villains could live and do as they would, with a barrier to keep them in and strip them of any use of magic or technology at the level of wi fi or higher. Only the most powerful artifacts, like the wand or the trident, would be of any use inside the Isle.
Since this blog accepts the sequels as canon, I’ve decided that Iago was stealing things in the chaos (since, lbr, he’s always kinda been up for that) and so was sent to the Isle for that, under the assumption he was working for Jafar or Nasira. Anastasia was basically browbeat into helping out her mother and sister during a low point in her marriage and so suffered a relapse of villainy during the plot (basically being promised it would make the baker and her problems go away). As for Horace and Jasper, well, lbr, they didn’t reform because they felt they were wrong - they just got tired of Cruella and so told the police everything was her idea. Seriously, saying they reformed would be like saying Harry and Gil ‘reformed’ if they got tired of Uma bossing them around and so told the police when they were arrested that everything was her idea. That may be, guys, but you went along with it 100% willingly, knowingly, and consciously. You can't blame that on your boss. If the getting was good, I can see Horace and Jasper getting involved as henchmen again (though probably not actively for Cruella again - my money’s on Evil Godfather).
The children were an unanticipated consequence - nobody thought about the villains reproducing. When they did, the decision to let them stay was based on a few things - one was compassion (since the heroes wouldn’t want to lose their children) and hoping the villains would still love their kids, another was apathy towards the kids welfare or active hostility, and another was based on the principle of the Isle being that the villains would be able to do as they would. Regardless, that decision was a very close vote.