The Dim is the realm of dreams and spirits. Dreaming mages with particularly lucid dreams may find themselves wandering the Dim. It is possible to interact with the dreams of others here, which many spirits choose to do fairly often. Indeed, some believe that nightmares are caused by a particularly nasty brand of spirit that delight in causing bad dreams.
Worldwalkers commonly find themselves in the Dim. They project their spirit directly into either the same realm as their body or into the Dim. Most of the information about this realm comes from experienced Worldwalkers who have managed to successfully traverse some of its varied domains. No person has ever managed to set foot in The Dim in their physical body.
While some spirits are benevolent or neutral to travelers, many are particularly malevolent and seem to exist solely to hunt down trespassers to their realm. While people have not managed to set foot into the Dim, many spirits have found their way into the Physical in the form of unwilling hosts. While not well documented, it is believed that spirits cannot manifest onto the Physical world without a physical vessel.