In the Seven Towers Alliance's public course, "Plane Science," there is a detailed description of the "Sea of Magical Power," the bedrock of the universe.
The Sea of Magical Power gives birth to countless planes, which are like bubbles floating on its surface.
The vast majority of these are unremarkable, ordinary material planes. Only about a tenth are special planes with their own unique Laws.
Then there are planes that are special among the special, renowned throughout the entire universe.
The Abyss is one such multi-layered, forbidden plane.
It is the source of chaos and evil, filled with chaotic Magic Power.
Its environment spontaneously tends toward filth and strangeness, and it is home to countless demons and other vile creatures.
The Laws of the Abyss are chaotic and filled with malice. Both its Magic Power and the materials it produces contain a strong "contaminating" property, and long-term exposure leads directly to madness or demonization.
