Revealed Illusions

As explained on page 84 of the Player's Handbook, if one subject successfully disbelieves an illusion and informs another subject of the illusion, the second subject receives a modifier to his saving throw. The amount of this modifier depends on the reliability of the informant and the magnitude of the illusion. If the informant in unreliable and the illusion is formidable (for instance, an illusion of a deadly monster), the subject might ignore the informant entirely; in this case, no special saving throw modifier applies. If the informant is reliable (the subject's commander or friend), and the illusion is relatively minor (such as the image of a small fire), the subject's saving throw can be modified by as much as +4

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