Intelligence

It makes sense that a highly intelligent wizard would be able to create more effective illusions. It also makes sense that subjects with low intelligence would be less likely to disbelieve an illusion. Therefore, if the caster's Intelligence is exceptionally high (18 or more), the subject's saving throw might be modified by -1. If the subject's Intelligence is exceptionally low (7 or less), his saving throw might be modified by -1. A -2 modifier is possible if both the caster's Intelligence is high and the subject's Intelligence is low.

Remember also that characters with exceptionally high Intelligence are automatically immune to low-level illusions. These immunities are summarized on Table 4 of the Player's Handbook.

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