Invocation Grade: Greater
Equivalent Spell Level: 5th
You can use a suggestion effect, as the spell. Additionally, when the duration ends or the task is completed, the subject must attempt a second Will save with a –5 penalty. If this second save fails, the subject completely forgets that you were the one who suggested the course of action mandated by the use of devil’s whispers, instead becoming convinced that it was his own idea—even if he’s not certain why he might have chosen to perform such an action. A successful break enchantment spell can rid him of this delusion, but dispel magic and similar effects cannot. You can have a number of devil’s whispers active at any one time equal to your Charisma modifier (minimum 1). Devil’s whispers is a mind-affecting compulsion effect.
Source: Cityscape, page 68.