One major tribe of the Medícae migrated west along the course of the River Khem, which rose in the hills surrounding Bharániá-Tsaeghé and flowed to the western sea. Along its banks, and in the fertile lands of the river's delta, they eventually established the Khemlath civilisation, under the rule of the sorcerous Shaman-Kings, the first great civilisation of the Medícae.
But even as this civilisation reached its height it was threatened, not by invaders, but by the changing climate. The declining ice age resulted in a slow rising of the sea level, and the lands surround the River Khem became increasingly swampy, as the delta of the Khem grew larger and expanded further inland, forcing the people of Khemlath to abandon the delta cities and move up-river.
In the end, the River Khem vanished almost altogether, and the lowlands in the northwest part of the Triad became the inland sea of Témor Úris. The mighty Khemlath civilisation was reduced to a small, struggling collection of city states, linked only by trade and the memory of past glories.
The traders of Khemlath, however, began to establish trade routes to other, more distant, parts of the world, and through them the Khemlath civilisation would eventually rise again, albeit in a very different form.