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At 20th level, a ninja becomes a true master of her art. She can, as a standard action, cast greater invisibility on herself. While invisible in this way, she cannot be detected by any means, and not even invisibility purge, see invisibility, and true seeing can reveal her. She uses her ninja level as her caster level for this ability. Using this ability consumes 3 ki points from her ki pool. In addition, whenever the ninja deals sneak attack damage, she can sacrifice additional damage dice to apply a penalty to one ability score of the target equal to the number of dice sacrificed for 1 minute. This penalty does not stack with itself and cannot reduce an ability score below 1.
So some questions came up during my last gaming session. The wording on this ability is extreamly vague and allows for multiple different interpertation. The term “cannot be detected by any means.” Can the Ninja talk to the party while he is invisible and if so is it a choice like with SR you turn it off for a turn? Also can scent pick them up or other abilites that would only indicate the square they are in like tremeor sense? Also what if I hit them with glidder dust it outlines them I can see the glitter not them. Does that count? The generic phrase cannot be detected by any means is loaded.
If any please provide examples that an enemey would be able to detect them.
If any please provide examples of the type of control the player has over the ability if any to allow allies to preceive him (sound)

Cheapy |

It's my understanding that the ninja just can't be detected. So scent wono't do it, he can talk but they can't pinpoint him, etc.
HOWEVER, it says nothing about things placed on him not being detected. So throwing powder everywhere will let you detect the powder on him. Same goes for glitter dust. Or him stepping in a puddle of water.
that said...the last time this was asked, the thread blew up into a 500 page flamefest.