The Spirit World is a parallel world, where Giant Animal Spirits preserve the balance. If one Giant Animal Spirit dies, the whole balance would be broken. Those spirits are: The Great Stag, The Great Bear, The Great Wolf, The Great Fox, and The Great Owl. There are also lesser spirits. The spirits can travel to the mortal world of Aravorn, and have shape-shifting skill, so they can seem human (or any other race). While it's a Plane of Existence, it can be accessed only through some specific places. One of them is a glade nearby the town of Ninim, in the permafrost area of Zoltar.