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Message: <blockquote data-quote="Jack Simth" data-source="post: 5721254" data-attributes="member: 29252">That only gets you creatures and objects, though... which, granted, gets you a very large number of illusion spells.  There are 47 Illusion spells in main section of the SRD; of those, only 16 produce an effect that meets the dual criteria of "knowing it's an illusion matters" and "can't be guarded via one or the other of those two spells".  Of those 16, one doesn't have a local effect (False Vision) and so it doesn't really matter as far as Detect Magic and it's ilk go.  Two don't have visual elements (Ghost Sound, Ventriloquism).  Two also affect a guard able creature (Mislead, Mirror Image) and creative use of  Magic Aura and Misdirection can be used so that knowing there's an illusion about doesn't really help.  So between Magic Aura, Misdirection, and some minor trickery, the only ones left as dead giveaways (out of 47 spells of the Illusion school in the SRD, mind), we have:Hallucinatory TerrainIllusory WallMirage ArcanaMinor ImageMajor ImageSilent ImagePermanent ImagePersistent ImageProgrammed ImageScreenSilent Image11 spells that can be foiled via the cantrip in question.  And there's ways to make that difficult, too; if the entire area is covered in, say, Screen (or even just Hallucinatory Terrain), then the aura of illusion will be there, regardless of other considerations, and so you'll effectively white out Detect Magic, rendering it useless for the purpose of noting other illusions.  Less than 25% of a school is an entire school, apparently, and a 4th level spell can fix even that (although you'll have to Heighten it for some of them, as you need the aura coating the big area to be at least as strong as the auras you're wanting to actually use).Edit:Come to think of it, <a href="http://www.d20srd.org/srd/spells/hallucinatoryTerrain.htm" target="_blank">Hallucinatory Terrain</a> is probably the RAW counter needed, handling both Detect Magic and Arcane Sight (but not Greater Arcane Sight or True Seeing).  4th level spell, so grants everything in it's area a Moderate aura of Illusion (if you need to mask stronger auras, Heighten it to 7th).  Lasts 2 hours/level, and has a stupidly huge area (one shapable 30-foot cube per level.  Shapeable effects can squeeze down to ten foot cubes.  So that's effectively 27 10-foot cubes per level).</blockquote>

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