Planes

There are seven planes of existence. Each being can see up through different planes depending on their level. All commoners should be assumed to see only the first plane while magicians can be assumed to see the first 3. Sight is an indicator of the highest plane that a being can see.

A being will only be identified by another as itself if the other being can see at a higher plane than it has tranformed to. If a demon is disguised on the 5th plane and your PC can only see to the 5th plane, they will not notice anything out of the ordinary. Sight is determined by your current level +ESS modifier. Because of the Visionary Aspect, Illusionists are exempt from this rule, and their sight is determined by current level +ESS modifier +2.