Moss Mountain is the largest of a range of mountains which act as the major divide between Asteria and Sailand. The only known residents of the mountain are the Kim-un-kur. There is no safe way across the mountains without using a secret path (which is usually sealed to travellers).
There are many tribes of the kim-un-kur that populate the mountain, Mukar is the tribe leader of one of the eastern tribes (The Shuros). The Asterian army also attempts to take a military patrol over the mountain range, while doing this Igneus tries to make a truce with the kim-un-kur and get safe passage through the mountains.