The Wailing Tayga is another great farming area. They can be found right over top of "Morheim" in Morheim Snow Fields. Their is an abundant amount of Tayga's here for you to farm from. The Tayga's drop the Gladiator Stigma for Advanced Dual Wield and the Sorcerer Stigma for Curse of Roots.
Both of these Stigma's will net you quite a bit on the Auction House, the Sorcerer's one will grab you even more. The Gladiator one will net you about 50-100k depending on your server and the Sorcerer one will net you up in the millions.
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