Ignis-quis-vir's Proto-Language

Monophthongs
Your language only possesses the 3 vowel morphemes /a/, /i/ and /u/. However, many more vowels are used because of various vowel mutations. Mutations occur only in syllables which are followed by a stressed syllables.

Diphthongs
Diphthongs do not exist in your language.

Consonants
There are almost no allophones for consonants. The only exception is /n/ which changes to [m] before /b/ or /p/ or [ŋ] before /g/ or /k/

Stress
The stress in your language is usually on the first syllable of a root. However, the stress can shift to the second syllable when the first syllable is open (doesn't end in a consonant) and the second syllable is closed (ends in a vowel).

Phonotactics
The syllable structure of your language is C(C(C))V(CC); C is a consonant and V is a vowel.

Onset
The following consonants / consonant cluster can occur in the onset:
 * any single consonant
 * plosive or fricative + /l/ or /r/
 * /s/ or /ʃ/ + /n/
 * plosive + fricative (same voice)
 * voiced plosive + /j/
 * alveolar fricative + plosive (same voice) (+ /l/ or /r/)

Coda
The following consonants / consonant clusters can occur in the coda:
 * no consonant at all
 * any single consonant
 * fricative + plosive (same voice)
 * nasal + plosive or /s/
 * /l/ or /r/ + plosive