Keystone Worldlines is one of the grand background mysteries of the Universe and transcends names and terms and in essence, is unknowable. Keystone Worldlines is in respect to the interpretation of an all-encompassing force above all others. Anything finite, changeable, fleeting, and conditioned cannot be attributed to Keystone Worldlines.

Keystone Worldlines encompasses the terms of boundless possible alternatives to a single actual world and of multiple actual worlds. There are hierarchies of boundless systems of "the way the world is" and there is no primary world-version i.e. "no true version compatible with all true versions." For every Fiction, Nonfiction, Transfiction, Fanfiction, Metafiction, Patafiction, Interfiction, Personal Fiction, Impersonal Fiction, Incompatibilism Fiction, Impossible Fiction, Speculative Fiction, Xenofiction, Universal Genre, Universal Trope, Paratexts, Memetic Fiction, Transformation Fiction, and a priori and a posteriori Fiction -- for every Type IV and Type V Multiverse, there are many boundless forms of realism and anti-realism beyond the necessity of contradictions.

Keystone Worldlines encompasses the ultimate reality and the primordial cosmic grand principle of creation which defines and underlies all of existence.

• The Universe at large is nothing but an illusion, akin to a returning daydream.
• The innermost essence at the principle of every being is grounded in an eternal, unchanging, ineffable, and undifferentiated infinitude, which identifies itself with both the microcosm of an atom and the macrocosm of the universe, uniting both.
• Keystone Worldlines are the fundamental processor through which all of the Universe's information is administered; a single Keystone Worldline controls and emanates the underlying information comprising all of reality and all meta-reality.

Keystone Worldlines

• Unsolvable Keystone Worldlines houses entities that are the pinnacle of be-ness that can be indexed.
• Indescribable Keystone Worldlines houses entities that are always qualitatively transcending greatness than what is proposed.
• Untold Boundless Keystone Worldlines are not limited by Platonic, Jungian, and Pataphysical transhierarchical systems.

There is an Unsolvable Keystone Worldline, an Indescribable Keystone Worldline, and an Untold Boundless Keystone Worldline that encompasses name-term realities and beyond name-term realities of Fiction, Nonfiction, Transfiction, Fanfiction, Metafiction, Patafiction, Interfiction, Personal Fiction, Impersonal Fiction, Incompatibilism Fiction, Impossible Fiction, Speculative Fiction, Xenofiction, Universal Genre, Universal Trope, Paratexts, Memetic Fiction, Transformation Fiction, and a priori and a posteriori Fiction.