The Spirit Age

When Essence first formed the worlds, the Spirits inhabited both of the realms. It is believed by scholars that the Spirits, in their endless pursuit of hoarding Essence, depleted the Mortal Realm of much of the Essence that made it up. Some scholars believe that Essence is a sapient being and forced the Spirits to the Eternal Domain, leaving the Mortal Realm to recover. It was at this time that many of the Chara Spirits created the Mortal Races in a bid to help foster the birth of more Essence. They were able to populate the Mortal Realm with these new beings, ending the time known as the Spirit Age and starting the Mortal Age.