Easiest way to get this is to buy one at 80 from one of the emblem vendors. They have idols for each spec. My personal favorite for feral is Idol of Mutilation
Just outta curiosity, do you guys use Idol of Mutilation or the idol off General for tanking? The 200 dodge is up 100% of the time, the agi buff is up less, though not sure just how much (after factoring in boss avoidance).