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Message: <blockquote data-quote="Jack Simth" data-source="post: 5721226" data-attributes="member: 29252">There's a number of ways to have what is effectively at-will Detect Magic, each of which costs a different set of resources.Permanency + Detect Magic (500 xp, requires minimum level 9).Persistent Spell + Detect Magic (this is actually the example used in Persistent Spell) (two feats - which are also used for other things - and a 6th level spell slot 1/day; usually doable at 11th).Vatic Gaze (PHB II; requires arcane caster level 9 and a feat slot)Magic Sensitive Reserve Feat (Complete Mage; requires a feat slot, the ability to cast 3rd level spells, and requires that you keep prepared (or know and keep a slot of that level avaialble) a Divination spell of 3rd+)Warlock-2 (requires spending two levels on Warlock - which you mentioned)Others (Custom items, wands, playing Pathfinder, certain funny races, et cetera).In certain cases, yes - specifically, in the case where there's exactly nothing on the other side of the wall, the person who put the illusion there isn't paying attention, and so on.  As noted by Greenfield, if the caster's there, the caster can cause the illusion to keep pace.Additionally, if there's a solid surface behind the illusory wall (perhaps a door of similar material to the wall, which is flush with the wall, much like, oh, a car door), then the pebble makes about the right sound, bounces, and hits the floor.  Sure, you maybe get your interaction will save, but not proof.  And, of course, if the dungeon includes real traps, and you use Illusory Wall, Phantom Trap, and other things that would leave an aura of illusion a lot, many of which are specifically set up to draw prying hands to the real traps (others of which aren't), then anyone who tries to lay hands on everything that has an illusion aura is soon dead by attrition.What's also fun is using Veil on incorporeal undead: "The pebble passed right through.  Must not be real.  Ignore it, keep looking for the illusiAUCH!"There's other things you can do... it's just that when opposed, you need to get a little bit creative with what you're doing.  So don't give them that time.  Arrange for consequences for poking every random thing.  Really, this is a problem with illusions in general, and is irrespective of Detect Magic.  Someone who pokes everything because it might be an illusion isn't going to need Detect Magic to have this effect.  Arrange for poking random stuff to not be feasible.  Traps that react to being poked is one of the simpler methods.A thrown rock would have detected it without a sweat, too, and saved you the spell slot, in as empty an environment as you appear to assume it's in.</blockquote>

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