Reservoir of Origin is a book of infinite pages with each page containing an absolute infinite amount of words that can teach one everything that can be learned within the Allscape. Just a mere page can grant one wisdom of accessing the limits of power.

"My dear, this is no mere book. Just one page alone contains all of the secrets of the Omniverse. Two pages contain all of the wisdom of the Omniverse. This book alone possesses an absolute infinite amount of pages, each with an infinite cardinality of supersets within them. And even with that, each one of those supersets contains an infinite amount of subsets within them.” - The Bishop.

Reservoir of Origin was introduced in Chasing Glory.

It is currently within the possession of Chastity Grace.

• Villain Descendingsword has fully read through the book.
• The Bishop has fully read through the book.