Shadow Door

By means of this spell, the illusionist creates the illusion of a door. 

The illusion also permits the illusionist to appear to step through this "door" and disappear, when in reality he or she has darted aside, and can then flee totally invisible for the spell duration. 

Creatures viewing this are deluded into seeing/entering an empty 10-ft x 10-ft room if they open the "door". 

Only a true seeing spell, a gem of seeing, or similar magical means will discover the illusionist.

The invisibly fleeing illusionist can be detected (cf. INVISIBILITY), but there must be active and concentrated attempts to do so. This will not simply be noticed in passing, as attention will be on the shadow door.