Kherge is a geographical definition, the Khergit people are split into six major tribes, who each have autonomy. They are the Panther, Hounds of Silver, Red Lion, Dragon, White Eagle and Black Swan clans. Every so often, the leader (Schah or Khalif) of one tribe will prove strong enough to be declared Emperor.
Khergits must have Khans. Schah? They are not persians. Khalif? Not Muslims.
They are horse-riding,raping,pillaging,horse-smelling,horse archering,horseflesh-eating raiders.
And Borcha and MArnid should have children.
Borchi and Mardin,able to hire.
And how do river pirated plague a country with experiences army? I kill them for fun lol