Editing Kyuad's Lorebook (section)

===Interacting with Spirits===
Other than via spells and the actions of other, similar creatures, spirits are for all intents and purposes removed from the physical world of Aryth. Normal men and women cannot affect them, and spirits in their natural state cannot affect normal men and women.
A bodiless spirit’s presence can be revealed by divination spells and a spell of force effect would affect a spirit, but a fireball would not, and no spells cast by spirits in their bodiless forms affect the physical world in any way.
Spirits would seem to be ideal spies, whether for Izrador or his foes. However, just as spirits cannot be detected, neither can they, under most circumstances, see or detect any details regarding the living. Time, place, and distance have little meaning to spirits, and getting spirits to convey meaningful information about what they’ve seen is quite difficult. Each type of spirit has a particular interest in and ability to observe specific things in the physical world; for instance, outsider spirits notice the life forces of other creatures with particular clarity, while elemental spirits are naturally attracted to the elements to which they are attuned.