Old Dwarven language

The Old Dwarven language was the earliest attested variant of the Dwarven language, and it is the second most attested ancient language of Artograch that was spoken before the Proto-Elven invasion of Artograch. It is still used as for religious purpose in the Dwarven religion, although with modernized pronunciation.

Grammar
In the Old Dwarven language, words consisted of two main parts: roots and templates. Roots consisted only of consonants, while templates consisted of vowels and "empty spaces" - empty spaces that were filled by the consonants. For example, putting the root (metal) and the template  (people, folk), we get  (Dwarves, literally "People of Metal" or "People of Steel").

Consonants

 * is special in the sense that it does not obey the broad-slender opposition, but instead can appear before both front and back vowels. Some speculate that was pronounced  before front vowels.
 * can be also considered a vowel, as it appears in templates too.

Vowels
In the Dwarven language, vowels are considered secondary to consonants. Front and central rounded vowels can only appear after slender consonants and, while back and central unrounded vowels can only appear after broad consonants. The total number of vowel phonemes is 5, or 10 if we count length too: /i iː u uː e eː o oː a aː/.

Since each one of them has a slender and a broad allophone, the total number of vowel sounds is 20.