Classical Dwarven language

The Classical Dwarven language - also known as Classical Dwarven Koiné - was a variant of Dwarven language, or rather, a stage during the evolution of the Dwarven Koiné. It was the lingua franca / koiné of the Dwarven region while it was a spoken language (between 1000 BEKE and 100 AEKE) - its spoken form eventually evolved into the contemporary koiné, while its written form merged into and influenced Temple Dwarven.

Evolution from Old Dwarven
The earliest step in the evolution was the voiced stops developing post-vocalic allophones. This was followed by the voiceless stops becoming voiced in the same postvocalic environments, except before other voiceless stops (including the glottal stop), where they became voiceless fricatives instead.

The above-described consonant shift was purely allophonic (thus neither phonemicized nor lexicalized) until complete removal of the schwa, which made the new non-sibilant fricatives phonemic. The voiced fricatives would be devoiced word-initially in clusters with voiceless stops, such as  →  →.

The aforementioned schwa-removal and word-initial progressivevoicing assimilation in consonant clusters also led to the creation of a whole new class of phonemic affricates.

However, most of these only appeared in their simple, ungeminated forms word-initially, usually appearing only in geminated forms word-medially. Many of them were unstable and would be either deaffricated or simplified into stops later on.

Simultaneously with the aforementioned consonant shift, the vowels had their respective allophones consolidated as  after slender consonants,  after broad consonants. After the removal of the glottal stop and the palatal approximant  (which happened after the aforementioend consonant shifts), these allophones truly became phonemic, although still with the constraint of only being allowed to appear either word-initially or after their respective class of consonants.

Vowels
The language also had one diphthong:.

The vowels in yellow - - could only appear after slender consonants (or word-initially), due to their historical origins as allophones of  after slender consonants.

The vowels in grey - - could only appear after broad consonants (or word-initially), due to their historical origins as allophones of  after broad consonants.