The Carved Tongue

Also commonly referred to as "The Sacred Tongue", this is a dialect of Ituur that is largely spoken by figures of authority in ceremonial positions and members of the various clergy that observe the worship and rituals pertaining to the gods of the pantheon in Isturian polytheism.
It is believed that its name comes from its origins, when it was first carved into stone at the advent of Ituur's creation. While the dominant language of Isturoth may have changed over time, the Carved Tongue has remained immune to linguistic developments, largely because it has been carved and then transcribed from when the religion's sacred texts were first set down.
Because this dialect of Ituur has become associated with religious worship, fellow practitioners may ascribe certain virtues to the Carved Tongue that don't apply to the common tongue. The Carved Tongue has often been vested with a solemnity and dignity that is shown to any sacred texts themselves. Consequently, the training of clergy in the use of a sacred language has become an important cultural investment, and their use of the tongue is perceived to give them access to a body of knowledge that untrained laypeople cannot (or should not) access.

Phonetics

The Carved Tongue has managed to make use of sounds that are no longer included in the common Ituur spoken throughout the kingdom. The most notable of these is the dental fricatives (θ and ð) which have become extinct in modern Ituur. On paper and stone, however, these characters prevail. When they are not spoken in the Carved Tongue, these sounds are approximated by the use of the alveolar plosives (t and d).
Another sound which is seen in the Carved Tongue but not mainstream Ituur is the voiced post-alveolar affricate (d͡ʒ) which has been replaced by the voiced alveolar affricate (d͡z).