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![Harsk](http://cdn.paizo.com/image/avatar/PF21-19.jpg)
If a creature has trueseeing and you blind it, does the trueseeing still function? Do you need to see something to see through its illusion or whatever.
This came up because we were fighting an eriynes with trueseeing. We blinded it but the GM ruled that it's trueseeing let it see us anyway. Wouldn't you need to see anyhow. Low light and darkvision quit functioning if you get blinded.
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![Goblin](http://cdn.paizo.com/image/avatar/PPM_Blogog.png)
The intent of True Seeing is to negate illusions, not to enable you to see everything in range - otherwise it would see through mundane stealth and disguises. Therefore I would assume that if you blind something with True Seeing they are still blinded.
However, because of this intent I would consider it fair to rule that despite the focus on visuals True Seeing also negates non-visual illusions, like Ghost Sound.