Ch 112: Evil (3)
Just telling Rein about how she was trapped by the dungeon was not the end of Sanakya's story. She had more things to tell him, especially about how this dungeon actually worked.
...
After she was teleported inside the dungeon, she found herself inside a dark place with nothing around. There the will of the dungeon itself started to talk with her. Sanakya realised that the will of the dungeon was not very mature. It was a little like a kid, a very evil kid.
The reason why it was trapping people who had held a position similar to that of a god was because at its birth, a theme was chosen for this dungeon by its unconscious self. And the theme it chose for itself was to a place where the challengers could fight against gods.
But the dungeon itself was unable to fully understand the concept of a god so in order to fulfill its objectives, the dungeon started to kidnap the type of people who had been in the position of being something like a god.