Someone said:
Why? Arcane sight and the Greater version point to Detect Magic. Detet magic says you can, at most, pinpoint the square where the aura is, nothing more. There´no need for an ad-hoc rule when the actual rules are pretty clear, leave common sense alone and only clash with a dictionary definition.
Well, they point towards a detect magic, but a stronger and more clear detect magic. Plus the "why" is that I think you could argue within RAW that you could indeed 'see' exactly where a magic aura is even with the detect magic cantrip ... assuming it stayed still for three rounds. Although that would indeed take some arguement.
Although I agree that's too potent.
Other 'why' for that would be a simple progression in power. Detect magic requires a lot of concentration. Arcane sight does the same as detect magic but it's a lot clearer... you can see it all right away. If you know the location of the amulet, cloak, and two rings... well, you can fire at the being wearing those rings. It doesn't locate the five foot square that the items are in, it locates the items. It even locates spellcasters and creatures with arcane or divine spell-like abilities. Once again, it doesn't locate the five foot square that they're in, it locates
them. Each, separately, individually. And someone with the sight up wouldn't be attempting to hit blind, they'd simply SEE the things. Really if I were to go strictly by RAW, I'd have to say that arcane sight alone pretty much negates invisibility, for those reasons. The rules do seem pretty clear to me, and they seem to pretty clearly state that you can indeed see exactly where that 'invisible' thing is. Common sense also states that it would be easy to hit something 'invisible' that you can also see.
Greater Arcane sight is even that much clearer. You not only see them, but you automatically know which spells or magical effects are active.
IcyCool said:
Exactly, nothing in the Arcane Sight spells says that it defeats invisibility. The spells state that they work like detect magic, which states that you can pinpoint the square where the aura is, and that's it. Where are people coming up with the "negates invisibility" talk?
Of course nothing in arcane sight says it negates invisibility... it just lets you SEE the invisibility's invisible-ness... And know where it is... and even target it.
I mean, nothing about invisibility says it negates divination spells. Although there are other spells that DO negate just such divination spells as this.
So, my 'why' is simple. A seventh level spell designed to see the location and type of magics should easily be able to detect someone using a second level spell to remain undetected... a third level spell being able to do so is a little iffy... and while I can reasonably see that it does see the exact location of the invisibility spell, and therefore the target, I can also see an arguement for making a house-rule to the effect that the aura can't be located beyond it's five foot square. Which would be a house-rule, obviously, but a reasonable one.