I thought some one would have made a post about this already but I can find no such post, forgive me if it is a repost.
I came across this object called "Unseen Force" while exploring Shado-Pan Monastery. When you right click it you get a buff called "Unerring Blades" which gives you a 90% increased hit chance for 15 minutes, but ends once you leave the instance.
This object is located right in the middle of the instance in an elevated graveyard area (Map Here). There are also two stealthed NPCs kneeling in front of headstones in the graveyard. I'm not sure how Blizzard intended for players to get to this object, there is no path to it so you will have to climb. As a druid I used wild charge and treants to get up there (easymode), I'm sure you can wall-climb up and you can probably slowfall-jump to it from a higher point.
The Unerring Blades buff adds a unique visual effect to your hands:
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