Bustax

A well-kno'n ancient literary language, demonstrably related to Tsonboran. The Bustaxian invasions of Levant begin around -3.7ka. The oldest inscriptions in the language date from -3.5ka. The Bustaxian Empire reaches its maximum extent (from central Persia and Afghanistan to Anatolia and Greece - not Caucasus, tho) around -3.2ka before decay sets in. The ruling dynasty takes refuge in northern Anatolia, and a separate Bustaxian state survives until trampled under the Altaic' expansion circa -1.4ka. Bustaxian continues to be used as a liturgical language.

Sound changes from Proto-West Persian':

to Proto-Bustaxoid

• Coda m → n, with typical POA assimilation also finally kicking in.
• Obstruent clusters simplify to agree in voicing and (where applicable) MOA.
  • P1F2 → F1F2
  • also PL → BL
• h → ɦ, then lost initially, converted into vowel brethiness elsewhere
• Dorsal fronting: plain velars become palatals, while uvulars become plain velars.
  • Labiovelars are preserved.
  • Palatal/coronal incompatibility: tc ct çs → tː cː çː
• ɸ θ s ɬ ç xʷ → β ð z j j w between voiced sounds
• Fricativ simplification: ɸ β θ ð ɬ ɣ → f v s z x ɡ
  • The ʀ allophone of former ʁ remains distinct by this stage.
• Cluster simplification continues: nw nj → nm nː