Stormtongue

Magical language mainly used by Nar Sylla and the high level priests of Orlanth.

Greg Stafford's Statement(2001)
No written form of Stormspeech exists. HOWEVER, the Lhankor Mhy script of the “highest level” is used to write down things in the language of the gods.

Their multiple scripts include one that is "common," and that is the one called Storm Script. It is Common because it is the one that Lhankor Mhy priests will allow other people to learn, and it is thus the most common one among the Orlanthi. This common script is also used (at times) to record the sacred words to speak in a ritual and thus might be used for Stormspeech. However, it does only an approximate job of transliterating the actual Stormspeech. The real speec must be spoken. Thus if you don't know the Stormspeech words you might not be able to recognize them written down. It would be like reading kanji words that were written in English.

Lhankor Mhy most often NEVER allow others in their culture to learn to read and write.