secret language of the Unholy Codex
The words of the Unholy Codex are written in a dark, secret language unknown to even the multiverse's oldest, wisest beings. What fragments exist in the world of scholarship are incredibly rare and prized above all other scraps of ancient wisdom across the planes. Yet the most learned academicians still have yet to decipher one word of this profane tome.
It is known that dragonborn scholars of Arkhosia studied the ciphers in the Codex and are thought to have made some headway in understanding its language. However, Arkhosia has been lost to history since the Previous Eon, as well as all records of their study.
In addition to deciphering the language, Arkhosian scholars are thought to have superficially understood the complex mathematical relationships between the Codex's various rituals that would lead one to be able to control the essences of all beings summoned from its pages.