1: The main character is reincarnated as a dungeon in a world where dungeons are a source of income, entertainement and training.

2: The main character is reincarnatedinto the hot desert of the world of Rishka as a member of the dangerous and armored dune worms

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3: The main character is reincarnated into a world as a member of the giant spider family.

4: The main character is reincarnated as a member of the hydra family (newborns start with one head and new ones grow depending on the strength of the hydra)