The game doesn't talk much about the Lagrange Kingdom. It was because of information control. This is because Nergius decided that if people knew about the demonic deeds that were going to be carried out in the Kingdom of Lagrangia, the authority created by the spirits of the dead would be further strengthened.

That's why Frederica Valentine doesn't know that hell. She later knows that the reconstruction will be complete when the story of a boy named Zarak begins, but she doesn't even bother to find out.