Accidental dungeon

A man, reincarnated into a magic world, fought his way to the very top, only to have to start again after an accident. He find's himself turned into a dungeon core and now he has to do it all over again. Maybe this time, he can even rise higher than he climbed before. On his side he has his trusted partner Luna - a dungeon fairy, for him she was more like a deus ex machina.   The story is written in the third person and contains multiple points of view. At the moment this would be the mc, Luna and a young starting adventurer. The story will not be continued. If you're interested in thereasons, you can read the last chapter.