Enogaeth

The primordial language of the gods, no one can write or speak it. Gods, however, can instinctively read it. Mortals who attempt to do the same find it confusing to look at, usually driving them to the point of uncomfortability.
It is theorized that the Old Gods could cause endless miracles by speaking it, and it was lost as an art when they came down from their thrones to congregate among the living.