Supernal

Supernal was the language of the gods. It was a universal language, understandable by any sentient mind (which heard the words as if they were spoken in its own languages). The gods shared their language with their servants, the angels, and devils spoke a version of it as well. Mortals were unable to learn the language completely, so the words of creation lacked power, and they were unable to use Supernal to make themselves understood by those who speak only other languages.

Supernal was written using hieroglyphics.