According to the Rough Guide to Kizenian Languages,
...the Kizenian language (limba Chizână) is the most commonly spoken language, and the de-facto main language of Kizenia, spoken by more than 70% of the population. Kizenia is the only nation in the world with a significant population of Kizenian speakers.
Kizenian is considered the form of the Ushalandan language as spoken in Kizenia, and the two differ primarily in terms of the writing system (Ushalandan uses the Tokundian alphabet, while Kizenian is written in the Selucian alphabet) and some vocabulary (Ushalandan is more archaic than Kizenian). Together, Ushalandan and Kizenian are considered a pluricentric language. Kizenian has acquired many loanwords from both of the other major Kizenian languages historically, however, particularly in the arena of the sciences and technology, where the words are more likely than not to be Kuzaki or Zyldavian in origin.
The writing system of Kizenia is a modified Selucian alphabet, based on the Endralonian script with modified diacritical symbols to reflect the variations of different sounds which Endralonian would have represented by a single symbol.