Behold, the entryways known as portals, which pseudoscientific workers of ancient epochs erroneously termed as "transitory devices of interdimensional shift." Within these pages, the reader may find the meticulously composed lore concerning their nature, function, and the cautiously forbidden rites surrounding them.
To initiate passage through a portal, one must first secure the requisite items, often listed in diminutive scripts upon the parchment known as the Codex of Departures. These items include, but are not limited to: a fragment of lunar essence, distilled in daylight of sanguine hue; three grains of salt derived from uncharted waters; and, of course, an insignia of personal resonance, which Western scholars might unceremoniously dub as "good luck charm."
Once preparations are complete, the user is to engage with the portal in a manner akin to caressing the surface of ancient stone tablets. Engage with the portal, but do not stare directly into its etherium void, for therein lies the risk of being ensnared within cycles of infinite regression.
Step forth, into the embrace of the symbols, the patterns which seem to depict sundry celestial alignments and terrestrial distortions. Only with full understanding, or utter ignorance, may one pass through. Seek solace in the knowledge: any attempts to reverse the passage must be accompanied by solemn chants of, "Apologies, O Great Elder of Unseen Realms."