Han language

Han was a language spoken by the ancient Han people of Kara-Tur.

History
Legend told that after the creation of the land of Kara-Tur, the gods themselves handed down the Han language to the Han people.

By the 14th century DR, Han was studied and employed only by philosophers and sages of Kara-Tur.

Related languages
It was the root tongue for the Koryo, Kozakuran, and Wa-an languages, and possibly others.

Kozakuran and Wa-an remained closely related; some considered them only different dialects of the same language. There was perhaps 65% comprehension between the two.

Koryo's vocabulary comprised many words evolved from the old Han tongue, as well as loanwords from Wa-an and Kao te Shou that had been borrowed over centuries. Koryo's vocabulary was very different to that of Kozakuran, but its grammar was very similar. Koryo sounded more like Wa-an than Kao te Shou, but it was as simple to use as Shou.

Thus most folk of Shou Lung, Wa, and even Kozakura found the Koryo language relatively easy to pick up, and most Koryoans in turn found Kao te Shou, Wa-an, and Kozakuran easy to learn as well