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there is a location in the preceding chief's camp, have you ever enter it? I also get stuck at the beginning till I find the chief's camp

You're looking for 'oddities' in the surrounding area. They're small, grey stone things with a blue glow to them.

Make sure to help out the merchant with their quest, to be rewarded with one. Another one can be found in the den of an enemy in the Glistening Stream.