Deal

"The world we inhabit lies above countless planes and dimensions—or, as the mortals of the lower planes call it, 'heaven'!"

"But even in heaven, light and darkness coexist. The so-called 'Inner World' is really less a world within than a place where the surface world casts things away... or, perhaps, a tomb for the gods!"

"According to the account of Lord Bervil, a planar wanderer, I spent many years researching and exploring. At last, I discovered that the Inner World of our world was once a prosperous, vibrant plane. Then the ancient gods discovered it and made it a prison for ancient Evil creatures and evil gods. From that point on, all the filth and darkness of the surface world began to gather in the Inner World..."

"And the gods, too, tasted the bitter fruit of what they had sown. After their fall, their divine corpses were also drawn into the Inner World and became floating islands, while their souls endured eternal torment..."

"According to Archmage Jarvis's theory, the Inner World is in fact the most convenient passage connecting our world to the countless planes and dimensions. If we could use it as a waystation, opening permanent portals between any planes and worlds without any loss would be no dream. It was a mad undertaking. I tried to dissuade him, but failed. The instant he opened the Inner World, the evil power that surged forth utterly destroyed everything Jarvis had, and even the resurrection spell he had prepared in advance was useless. The radiation and aftershocks that remained also caused a great disaster. The Second Mage Calamity began..."

Wu Ming was reading through the notes of a legendary mage.

The writing was casual, clearly jotted down by the mage on a whim, and contained many secrets about Different Planes