:
The name "Codex" suggests a reference book, and "Saerus" sounds like a fantasy name. If this is a (like D&D 5e, Pathfinder, or OSR), common features of such a PDF might include: codex saerus pdf
Step-by-step meditative visualizations or active psychological "workings" meant to facilitate self-evolution. : The name "Codex" suggests a reference book,
A cornerstone of the text, this ritual is designed to desecrate religious symbols (specifically Christian) to free the practitioner from conventional morality. codex saerus pdf
Here are the most likely possibilities for what you're referring to, along with potential "features" based on context:
