Mind fog

Mind fog is an enchantment spell that summons a magical fog to muddle the subject(s) mind(s).

Effect
Mind fog produces a bank of fog that weakens the mental resistance of those caught in it. Creatures in the mind fog suffer a -10 competence penalty to all Wisdom checks and Will saves. (A creature who successfully saves against the fog is not affected and need not make further saves even if it remains in the fog.) Affected creatures suffer the penalty as long as they remain in the fog and for 2d6 rounds thereafter. The fog itself is stationary and lasts for 30 minutes (or until dispersed by wind).

The fog is thin and does not significantly hamper vision.