False Vision

Any attempt to observe anything within the area of this spell from most kinds of scrutiny will fail. Those looking into the area see a false image (as the spell advanced illusion), as defined by the caster at the time of the casting. As long as the duration lasts, the caster can concentrate to change the image as desired. While not concentrating, the image remains static. Those inside the affected area can see and hear outside the affected area normally. Anyone inside the affected area are immune to ESP spells. Divination spells like magic mirror, clairvoyance, and clariaudience cannot perceive anything within the area. False vision does not stop creatures or objects from moving into and out of the area, but they will likely need to disbelieve the illusion before they try.