Chthonean

Chthonean (魔界文明クトネアン 語ご) ( 𐀒𐀵𐀚𐀀 ) is a language spoken by the inhabitants of the Underworld. With several differing dialects and varieties across the realm, it serves as the lingua franca of the majority of the Underworld, as well as the official language of the Underworld Commonwealth, which would later be overthrown by the Underworld Legion and replaced eventually by the Underworld Union.

Script
The writing system of Chthonean and all its local dialects and descendant languages is similar to East Asian languages such as Chinese or Japanese, composed of over a hundred symbols representing syllables or words.

Syllabic Characters
The Chthonean script consists of 60 known characters, each representing a syllable instead of a specific sound.

Special Characters
Outside of the 60 core syllabic characters, the script also apparently contain a number of other symbols that represent other and/or special syllables.

Unknown Characters
Other characters seen in text are unknown, with no known or questionable pronunciation or meaning.

Logograms
In many cases, an object or idea can be represented not by a word composed of a number of characters, but by a different individual symbol.

Dialects and Variations
For over 6,000 years, Chthonean was influential to the communication between races and kingdoms in the Underworld and has evolved to continue to be taught and refined throughout its many regions. As a result, nations or races that adopted Chthonean made a few to several alterations, including writing, pronunciations and terminology, with their own version of the language to fit their culture and/or standards, creating new variations and dialects. Also, with its very expansive syllabic writing system, for each different dialect or language that adopted the same writing, old or new characters themselves were created, changed, shifted or dropped.

Common Chthonean
Also known as Luciferian Chthonean, this is the most common type of Chthonean spoken throughout the Underworld. It serves as the language of commerce throughout the Underworld Commonwealth.

Mycenaean Chthonean
This variation of Chthonean spoken by the inhabitants and members of the Mycenaean Empire mixes the language with Olympian, with the pronunciation of several words in the dialect similar to the predecessors of the Greek language. After the Empire was sealed, the language would continue to be used for centuries by the Minoan and Mycenaean peoples in ancient Greece before it died in the aftermath of the Bronze Age Collapse. Both Olympian and Mycenaean Chthonean would be the basis for what would eventually be Greek.

Trivia

 * The term Chthonean is based on the ancient Greek term "Chthonia" (Χθωνία) which meant "of the earth/underworld".