The Script of Thu'úsa

Publisher's blurb:

Learn the script of the Temples of the Gods of Stability - Thu’úsa! Thu’úsa is an argot, an artificial language, based upon a no-longer-spoken tongue once employed by the ancient inhabitants of the Kúrt Hills in central Tsolyánu. The primary use of this tongue is literary and arcane: secret texts that priests of the Temples of the Lords of Change cannot read. Spells written in Thu’úsa are thus supposedly available only to servants of Stability. If you wish to read The Ocean of Secrets, you will need to know Thu’úsa!