Spiritual Realm.
The Spiritual Realm is a parallel plane of reality that coexists alongside the physical world and is home to the spirits, immortal supernatural entities which often embody different aspects of life and nature.
There are only a few known methods to enter the Spiritual Realm.
One of them through meditation, only very few individuals with a lot of training being able to achieve it.
Some places are said to be gates to the Spiritual Realm, but again, not everyone is able to pass through.
Being carried by a spirit to the Spiritual world is also a way in.
And finally by opening a gate with a certain spell.
Very few mortals have done it, and animals are incapable of doing it.
On the other hand it is commonplace for wandering spirits to enter the physical world.
Time in the spiritual Realm flows slower than in the physical world.
And contrary to the physical world the Spiritual Realm is unlimited in space.