Eugene's World

Eugene's World was the prison of Eugene Tacitus. He was imprisoned there after his insanity drove him to murder his son. Eugene was the author of the world, with his writings dictating society. The prison took the form of a castle.

Society
When a king was crowned he was proclaimed a god. An initiation ceremony involved the new king having blanks fired at him to test his immortality. It was just that, as he was immortal, there was no point to firing real bullets. Every few years an apparition of Eugene's son destroyed the realm. Killing the inhabitants before being killed by Eugene.

Eugene stopped the cycle when he had his son kill him. (BFA: The Holy Terror)