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Message: <blockquote data-quote="Awesome Adam" data-source="post: 6807207" data-attributes="member: 6808678">Passive investigation like that would pretty much destroy the usefulness of illusions.It would be an arms race and illusionists would be at a disadvantage.Base DC for Illusion = 8 + Ability MOD + Prof BonusPassive Investigation = 10 + Ability MOD + Prof BonusAny Wizard worth his salt who took Investigation would generally see through every illusion, cast by anyone appropriate for his level , automatically, even when he had to no reason to suspect an illusion.Which would encourage a DM to use higher DCs on the invisibility, putting everyone else at a sever disadvantage.A level 1 wizard with a 20 INT rocking a Passive Investigation of 17, could only get his own illusions up to DC 15. In fact, he could NEVER create an illusion capable of fooling his equal.</blockquote>