DESCRIPTION

You detect illusions cast by someone with a lower caster level than you. If the caster level is equal to your own, you must make a caster level check (1d20 + caster level) versus the save DC of the spell. The amount of information revealed depends on how long you study a particular area or subject.

1st round: Presence or absence of illusions.

2nd round: Number of different illusions.

3rd round: The location of each illusion.

This spell tells you only that illusions are present, not exactly what those illusions are, but knowledge that illusions are present gives you an automatic +4 circumstance bonus to any saving throws required to disbelieve the illusion(s).