Consider the Retronomicon

Retronomicon [/ˌɹɛkɹəˈnɑmɪkən/]. Noun.

1. Any nonexistent media artifact that serves as the imagined or imputed retroactive source for a field of meaning or sense (e.g., a genre, a mode of aesthetic production, or a school of thought).

2. Hyperstition. A network site of increased hyperstitional activity or productivity that operates more effectively by not existing.

3. A formal template or secular format derived from the Necronomicon. Example: “Every Necronomicon is an instance of a Retronomicon.”

Morphology of the retcon

Lovecraftian pseudepigrapha

The Retronomicon