Heretical Tome of Accursed Enlightenment

Imprisoned in this unholy opus is forbidden knowledge that not even the highest of society know about. If you are caught seizing even the most meagre glance at but the cover of the blasphemous script, you are immediately killed on sight then your corpse shall be burned after an exorcism. The church desperately tries to keep this heathenous wisdom hidden deep in the final floors of the catacombs beneath their sacred temple. They cannot destroy it, they haven't the means to. Every single instrument at their disposal had tried and failed to rip even a single page from it. Without the knowing of your fellow priests, you snatch a quick look at a few of the pages. Your mind begins to swell with unknowable information, and your soul turns dark as night. This was a mistake.