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Detect Magic only detects magical auras.
1.Detect magic will find the aura of the trap, but it will not tell you that it is a trap. It will take 3 round though
2.Same as number 1. You would detect an aura of the Illusion school of magic, but that does not mean someone is invisible.
3.same as the above. You can pinpoint the aura, but that is all you see. If they move before the 3 rounds is up you don't know what the aura was, only that an aura is there.
Magic Mouth and Invisiblity are both illusion spells of the same level. You would be able to detect that there was something there, but you would have no idea whether it would start speaking to you or slicing into you.
Detect Magic vs. Invisibility is more or less irrelevant. Even after 9 days of looking right at the joker you will never negate the bonuses for the invisible characteristic.
Invisible: Invisible creatures are visually undetectable. An invisible creature gains a +2 bonus on attack rolls against sighted opponents, and ignores its opponents' Dexterity bonuses to AC (if any).
Yes, Detect Magic let's you know about where the creature would be.
Yes, Detect Magic let's you know about where the creature would be.
Not quite. You get "Faint Illusion, Glamer in this area" It'll help you find a creature, but not enough to negate or reduce the 50% miss chance. a Spellcraft check would let you know that it's an invisibility spell, but not what the spell is cast upon.
Kinda irrelevant though if you already know that there's a creature in the area under an invisibility spell. you'll see the faint magical aura in turn 1. Since you can see the faint magical aura, you know where it is. Since you know where it is, you can attack it, but with that nifty keen 50% miss chance due to fighting an invisible enemy.
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It is interesting to note that by the RAW, the 3rd part of Detect Magic requires line of SIGHT, not effect, to figure out the school of magic. You can still detect the location of the aura, but can't figure out the school. Which should tell you immediately that it is Invisibility.
Course the point of the topic is finding the target's location, not necessarily the school of magic being used :)
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If you can detect the spell but not the school, you know for pretty certain that it's Illusion.
And yes, if you're willing to stand there for three rounds using your standard action every round to concentrate, I don't see anything wrong with permitting you to discover the location of an invisible person. You still can't see that person, but you can target their square.
Yes, Detect Magic let's you know about where the creature would be.Not quite. You get "Faint Illusion, Glamer in this area" It'll help you find a creature, but not enough to negate or reduce the 50% miss chance. a Spellcraft check would let you know that it's an invisibility spell, but not what the spell is cast upon.
Kinda irrelevant though if you already know that there's a creature in the area under an invisibility spell. you'll see the faint magical aura in turn 1. Since you can see the faint magical aura, you know where it is. Since you know where it is, you can attack it, but with that nifty keen 50% miss chance due to fighting an invisible enemy.
Ehm... You don't know the location of the aura, so you can't attack in the first turn. You know in which 60 feet cone it is, but that doesn't help attacks with attack rolls. You could fireball the s@@! out of it though.
It isn't until 3rd turn you know the location of the aura.
Oh, and you don't automatically know the school - it's a knowledge (arcana) check with a 15 + spell level DC, so invisibility is a DC 17 to identify it as illusion. At low levels there's a very large risk of failing, and knowledge checks are non-reroll. And for a cleric, druid or sorcerer there's a large risk even at higher levels as those doesn't always max knowledge (arcana).
It is interesting to note that by the RAW, the 3rd part of Detect Magic requires line of SIGHT, not effect, to figure out the school of magic. You can still detect the location of the aura, but can't figure out the school. Which should tell you immediately that it is Invisibility.
Course the point of the topic is finding the target's location, not necessarily the school of magic being used :)
You can see the aura of the invisible creature. Invisibility doesn't prevent line of sight - the emphasis in that term should be on "line".
Also, as said, there's always a risk you can't identify the aura. A standard 3rd level wizard will usually have +10 to +11 in knowledge (arcana) (3 ranks + 3 class + 4-5 int) so there's a fairly decent chance of failing the roll despite having line of sight.