Deep Speech

The language of the Eldrikari and their kin and followers. The language is often considered gibberish by those who haven't yet been influenced by Eldrikari, but makes more and more sense the further one's mind has been influenced by the Eldrikari.

Script
The Drow were the first to put the Deep Speech they had learned from the Illithid to writing. What initially began as transcription of Deep Speech sounds using ancient Elvish turned into a language all its own, a warped script of glyphs that seem to depict ideas rather than sounds.