City: There Is a Ruined Castle in My Dream

Three years ago I started having a recurring dream. In my dreams, there were terrifying empty-shell monsters and humans who could use superpowers. In order to survive, I learned to fight. When I looked into the distance, I saw a dilapidated castle in the hazy gray mist. My intuition told me that I should go in and have a look, so I made unremitting efforts. When I woke up, I suddenly found that everything in the dream was true. Empty shells, pattern keys, broken energy, existences beyond imagination suddenly broke into my life. And when I wanted to escape, I suddenly realized that I was trapped in a whirlpool.