If you're trying to get the achievement In The Hall Of The Thunder King, get working on it not, because as soon as Patch 6.0 drops the achievement becomes a Feat of Strength, and the key will no longer drop. That's the word from Kaivax on the forums.

Kaivax - Treasure Room Achievement -> Feat of Strength

n WoW Patch 6.0.2, we will be retiring the Achievement In The Hall Of The Thunder King, as the treasure room will no longer be accessible. That achievement will become a Feat of Strength, and Elder Charm of Good Fortune will drop in place of the key to the room.

source

I admit I don't understand the reasoning behind this. First the legendary cloak, then the Brawler's Guild, and now the Treasure Room, all effectively removed in a few weeks. Seems strange to see so much content going inaccessible like this. But you've been warned, so if you're working on this, get a move on.

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Tags: Isle-of-Thunder, Patch-6.0, Treasure-Room

Filed under: Analysis / Opinion, News items, Mists of Pandaria