The ability to blindfold/put a sack or bag over someones head, to prevent them from being able to see, and or know where they are going, where they are.
(With no stumbling about if you are following someone, or subdued)
voluntary blindness has been a request for a while, I feel.
It sure would make kidnappings easier than "twink for 20days played so my bludgeon skill can just knock them out".
There are... other ways of doing it, for kidnapping sake. I'd prefer "wear this blindfold over your eyes" to it, though.
(http://i0.kym-cdn.com/entries/icons/original/000/017/880/hqdefault.jpg)
It makes kidnapping easier yes, as you can still just way and explain who's kidnapping you, what they look like, where they are taking you, what they are armed with, what area you're in, where to look, what they are wearing...