"Increases reputation with the DENIZENS of Pandaria by 1,000." The Landfall Factions are not Denizens of Pandaria neither are the Sunreaver Onslaught and Kirin Tor Offensive.
As a followup to Noteworthynerd's comment, this item was nerfed due to some of the more... ambitious players transferring alts to massive amounts of servers to farm this many times at once to get Exalted Klaxxi/Celestials/Lotus/Shado-pan way before it was supposed to be possible.
As a result, the item now has a 7-day cooldown when used to prevent mass use by a single person.
Lastly, I'd like to reiterate Noteworthynerd's warning: this item can only be used once. There have recently been several scamming players who have tried to deceive people into thinking that the 7-day cooldown means it can be used multiple times. This is not true.
Dropped by Scritch, a rare hozen in Kunlai Summit.
It can be used to obtain 1,000 rep from the following factions:
Note: This item is consumed on use, meaning it can only be used once.