Zii

The Zii are the guardians of the Second Realm put in place at The Great Forgetting . They are the Deities

Deities

How Deities work

Deities are created from belief and power.

Two kinds of Deities

The High Deities

The Low Deities

Spirits

Spirits are specifically the ferriers of death. They spawn out of traumatic deaths or deaths that shouldn't have happend--deaths that could have been avoided should anyone have been watching. They then become the watchers.
In many cases, Spirits guard the line between nature and civilization, between order and chaos. Their steads are small and specified to each spirit, but important.

Older Zii

The older Zii are more of a theory than proven fact. Many people suppose that the Sun, Moon, and other powerful natural forces are actually, in some capacity, Zii.
They aren't...they aren't particularly relevant to much, but dabbling with beliefs is interesting, especially if it has no consequences.