Source: Book of Spirits p140
This Numen assaults a person’s mind with a cavalcade of nightmarish imagery, breaking down his sanity in the process. Such images are often personal and culled from a victim’s own memory, although the user sometimes applies images from its own history or “memory” to decide such visions. Use of Dement is a contested action, with opposing rolls being made reflexively. Spend one Essence and roll Power + Finesse versus the victim’s Intelligence + Supernatural Tolerance. If the spirit rolls the most successes, the victim gains a mild derangement of the Storyteller’s choice (see the World of Darkness Rulebook, p. 96) for a number of days equal to the successes rolled. If the victim already possesses a mild derangement, the derangement the derangement becomes severe rather than possessing another derangement. If the target of the Numen rolls the most or an equal number of successes, the power has no effect on him, but successive attempts are possible.