In ancient times, the world was divided between earth and sky. Many races common to today can trace their origins to the mysterious skylands that once floated above Argus for millennia, possibly for millions of years. Most exotic and monstrous races have longer, more well-known history within their cultures, having been the true inhabitants of the continental land masses. This can be assumed as the way of life for most of history, until the cataclysm known as "The Rift" occurred 3599 years ago.
The Ethereal Plane, overlapping all planes, was ruptured and twisted by a force of immense magnitude. Influence of other planes and the cosmic fabric of magic energy itself were pulled in by the immensity of the current Material Plane. Named the same as this event, the Rift opened up in the ocean, splitting the continents and making the Tranen Ocean impossible to cross by ship due to a ceaseless storm wall and unfathomably rough seas. Other such anomalies appeared, but none other to the scale of the Rift.
With this event, the skylands began to fall from the sky in all parts of the world. Across Argus, the ethereal bleed allowed the elemental planes, Feywild, and Shadowfell to seep into Argus seemingly tied to areas of similar composition. Part of the influences brought were deep wells of magic, something that appeared to have been only weakly present before the Rift. Whatever kept them afloat, was not magic as we know it in the present day. With the races forced into conflict, magic became the tool that allowed the world to be conquered and civilization to build.
Thus began the Arcana Age.