More or less, the invention of sand travel.
The prime timeline of Unos. May split into alternate timelines, though purely in a "what if" fashion as opposed to a magical or tech reason.
Civilization forms and booms. Technology industrializes among humankind. The island of Cha Tesid sees the erection of the capital city. The invention of the truck leads to exploration and initial colonization, as well as the rise of the Vidu. Their reign of chaos and mass ransacking is put to a bloody end during the Battle of Hemitt's Expanse.
Remaining Vidu forces and officials are routed. With a new perspective on how fragile civilization can truly be, a cultural shift happens almost immediately. Society takes a breath to rebuild, and new explorations begin. The core colonies become mighty cities (though none as mighty as Tesid Devys on Cha Tesid), and dozens of new colonies are formed across the erg. The agamians are discovered, and first contact is made.
Better leaders come into power among the ancient nations of the erg, and war is soon stopped. Formed to start this new era is the Union, an impartial entity comprised of most free nations and dedicated to resolving conflict sans bloodshed. The Union was an extremely effective solution, and political tensions all but faded away. A flare-up would happen occasionally, and sometimes a skirmish or two would begin, but it would be settled very quickly. Most of the war technology was turned towards the Voschok and other criminality, as well as creature hunting. This is considered by many historians to be the "second golden era". And, for many, many, MANY years, life carried on in a basic pace for the populous of Unos.