The Spook spell enables the wizard to play upon natural fears to cause the target creature to perceive the spellcaster as someone or something inimical which then appears to advance upon it in a threatening manner. If the creature does not make a successful saving throw vs. spell, it turns and flees at maximum speed as far from the wizard as possible, though items carried are not dropped. The creature has a saving throw penalty of -1 for every two experience levels of the caster, to a maximum of -6 at 12th level. Although the caster does not actually pursue the fleeing creature, a phantasm from it's own mind does. In any event, the spell functions only against creatures with Intelligences of 2 or more, and undead are not affected at all.