The Codex Infinity spontaneously manifested at the moment when the Arcane Fracture's chaotic energies achieved perfect information density, creating a singularity of knowledge that transcended dimensional boundaries. As reality fractured into ten distinct magical realms, the Codex absorbed every possible interaction, permutation, and synthesis that could ever occur between conflicting magical schools. It exists as both record and prophecy, documenting infinite possibilities while guiding wielders toward the most stable pathways through dimensional chaos.

The Codex appears as an ancient tome bound in materials that shift between the signature elements of all ten realms, its pages writing themselves in real-time as new magical interactions unfold across the Fracture. Its glyphs constantly transform between realm-specific languages, automatically translating complex magical concepts into forms the wielder can comprehend. Despite its finite physical appearance, the Codex contains infinite depth—pages multiply endlessly when specific knowledge is sought, revealing increasingly detailed information about cross-realm magical synthesis. The tome responds intuitively to wielders' needs, opening to precisely the knowledge required for their current magical challenges.

The Codex serves as the ultimate arbiter of magical possibility within the Arcane Fracture, actively guiding wielders through the most dangerous convergence events by revealing safe pathways for cross-realm synthesis. It prevents catastrophic magical failures by predicting the outcomes of unprecedented magical combinations before they occur.