Kingdom Hearts AU
(This follows the events after KH3 Remind I am not using any ideas from the new game)
The guardian's of light are searching for Sora but realise that he must be in a world that can't be easily reached so they are left with three places to search:
Scala ad Caeilum
The Final World
and The Realm of Darkness
but what they had found was far worst than they imagined.