Hello,
I've got few questions for you.
What's the correct behaviour to maintain when a Rogue (with many magic objects) is trying to hide using stealth while someone else is tryig to catch him using a detect magic spell.
All the magical objects have an aura that can be perceived, but the rogue is hiding, can the rogue hide also this aura or the spell will automatically detect it?
What changes if the rogue is under cover?
Thanks.
Shadow
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Detect magic can penetrate a certain amount of material (check the spell description). The rogue needs either cover or concealment to hide, barring Hide In Plain Sight or a similar ability. If the rogue is using cover, chances are detect magic will be foiled. If the rogue is merely using concealment (shadows or fog, for example), detect magic will detect any magical auras they have.
The trick is that detect magic takes 3 rounds of concentration to narrow down a each aura to a point in space, and detect magic only covers a 60' cone of area. Now, if the caster knows that they're supposed to be the only thing in the area with any magic, and they find a magic aura that is then gone in the next round or two, they'll know something's up. They just won't know exactly where that something is.
Arcane sight, on the other hand, works very well as an invisible/concealed rogue detector.