The Yoroni are the returned spirits of the legions of the War of Hosts, primordial shards of Creation and Destruction that fought for supremacy under the Four Horsemen, near the dawn of this cosmos of Balance. At the end of the War of Hosts, when the Dragons defeated the Four Horsemen, the foot soldiers of this conflict, humble shards and motes of Primordial Creation and Destruction, were gathered up and cast into the Elemental Cores of Balance, in the hopes that the overwhelming environment would change them or break them down.
There, they endured millennia untold, the inimical forces slowly grinding away their power and very personae. This changed a few millennia after the dawn of mankind, when an isolated tribe developed a unique philosophy and began worshiping balance and its constituent parts: the elements and the Void, birthplace of primordials. Given the nature of belief, these prayers slowly found their way to their Ideals, the depths of the Elemental Domains where the primordial spirits first perceived them.