Why do all the Monsters Come out at night?

Once upon a time, long, long ago- Well, more like twenty years ago...
Belle married her Beast in front of 6,000 of their closest personal friends.
Big cake!
Yeah, so instead of a honeymoon, Beast united all of the kingdoms and got himself elected king of the United States of Auradon.
He rounded up the biggest island for the monsters of the world, the Land of Monsters, forbidden to interact with humans for the rest of time.
Talk about on the nose.
Then he rounded up all the villains and sidekicks- basically all of the interesting people- and he booted them off to the Isle of the Lost.
Asking the Fairy Godmother to create a magical barrier to keep them all there, in their respective Islands of course.
This is my hood. No magic. No wi-fi. No way out... Or so I thought.

Repost from AO3
Title is from 'Monsters' by All Time Low feat. Demi Lovato & blackbear