The Spirit World

The Spirit World is a plane in which the souls of dead mortals reside, either permanently (such as in the case of the Kami and Primordial Spirits) or until accending.

The Fall
When the Primordials had finally broken through to the material plane of Annora the multiverse had begun to collapse. The Ro sacrificed himself to save it, sealing both the primordials and remaining gods out of Annora.

When the planes collapsed onto Annora, the Spirit World was no exception. Spirits were now trapped on Annora, existing in a sub-plane touching the plane on the region of Zhari.

Primal Spirits were weakened and could no longer interact with mortals themselves, and had little control over nature.

The Yuan-ti
When the Yuan-ti enslaved the people of the Zhari region, the Primal Spirits assisted them in earning their freedom.

The Spirit War
During the reign of the Zu Empire in the Zhari region, it's people soon began to mistreat and abuse the abilities of the spirits. Enslaved by the people they had freed, a civil war broke out with the people of the newly formed Osaru siding with the spirits. This began the Age of Famine, which ended with the collapse of the Zu Empire.