This spell requires that an item belonging to the target be in the caster's possession. When cast, an unwilling target must make saving throw vs. spells or have all major aspects of his personality revealed to the caster. Thus, if the target is a mage, a rajah, a lothario, or a liar, the caster knows it. Note that the see all faces spell reveals only truly major aspects; if the aforementioned target also liked chocolate and raga music, this would not be revealed. Since this spell does not affect the mind, mind shielding and Wisdom bonuses are not effective defenses.
Notes: Common for priests from a Vedic (Indian) culture; otherwise very rare. (Updated from Dragon Magazine.)