"Mask of a Thousand Tomes
Aura faint divination; CL 5th
Slot head; Price 10,000 gp; Weight 1 lb.
The random snippets of script that write across the surface of this parchment-colored eyeless mask hint at the knowledge of the many tomes stored within.
The mask grants its wearer a +10 competence bonus on all Knowledge skill checks, but the wearer is blinded while wearing the mask. The mask must be worn for 10 minutes before the wearer gains its bonus."
So you are blind. How does the mask know what you want knowledge about.
Does it just give you everything in a certain radius? Do you have to touch the item if it is an item.
Do you ask it questions with your and it answers?
The price of the item is significant and could be useful but without knowing how it works each GM different opinion makes it uber frustrating.
I need a good/plausible explanation for GMS.