Planes of Existence

Not to be confused with Realms, Planes are different levels of reality that overlap a Realm. While mortals are only able to view the First Plane as a rule, there are powerful beings able to see and operate up to the Seventh Plane and beyond. Beings in possession of such powers view all Planes at once, overlapping and merging together perfectly.

The First Plane
At a base, the First Plane is everything that any ordinary mortal can observe and interact with.

The Second Plane
Some magical creatures (elves, fey beings, specters, plane-touched beings etc.), and even some non-magical creatures (cats, some birds, or other creatures with impeccable perceptive abilities), can see, but not operate on, up to the Second Plane.

Other magical creatures, like imps, are able to magically disguise themselves in mundane ways on the First Plane, but show their true forms on the Second Plane unless they poses a higher level of magical capability.