Aeternum is a realm separate from our own, home to all manner of magical beings. Ruling Aeternum is The World -- that is, until recently.
The World was overthrown by The Tower, for reasons known only to them. The World believes that Aeternum will die without him on the throne, so he has taken it upon himself to summon a human to help him.
The World believes that this human will help him unite the Arcana to take down The Tower. But each of the Arcana have their own agendas and loyalties. Will they help or hinder their "hero"?