Great Migrations

The Great Migrations were a series of large scale movements of human tribes which happened sometime between 8000 and 6000 years ago. The Migrations encompassed the entirety of Var Venail, and the vast majority of contemporary humans are descendants of those migrants. The reasons behind the Migrations is the subject of many debates among scholars and no theory has proven to be accepted by a majority. With the exceptions of the Remanites (ancestors of the modern Araners) and the Old Yonda which came from the Great Desert, it is unknown where the other tribes came from. The humans of the Desert, the Cold Steppes and some of the peoples of the Southern Kingdoms seem to be the natives of their own regions, however every other people today seems to have come from elsewhere in this period. It is also unknown if the migrating tribes supplanted local peoples upon their arrival or arrived in previously uninhabited lands. The exception is again with the Remanites, as it is known that they met and mixed with the ancestors of the Halflings. 
Today the most popular theory in the Magisterium is that the Migrations were caused by some sort of technological revolution, namely in agriculture. Others have imagined technical or magical breakthroughs of other kinds. A large number of magisters suggest that the Migrations were caused by divine intervention of some sort. Another group believes that the Migrations were caused by a natural or magical disaster of great scale. There are also some who believe that the humans arrived from another of the Venails in this time and progressively settled. This theory is however widely considered untrue as the sailing technology required only arrived with the elves millennia later.