Need help finding a written adventure.

I had an idea for a campaign quite some time ago, and I wanted to know if there’s any other preexisting written adventures (homebrew or official) that are at least similar to it.

The idea is basically that the players are meant to be powerful villains (lvl 11-13), who one day wake up to see the realm falling apart, and so they end up having to work together to solve the mystery of who did this and how to fix everything, since they won’t have a world to conquer or terrorize if there is no world to begin with.

Also, I’m not sure if this is the right flair for my post tbh (didn’t see or find any rules for that), so if I was meant to use a different one, I’d really appreciate if someone let me know.

Either way, thank you all in advance for your attention, have a wonderful day ^^