Thanks as always, its the side story one called Alan’s Pack.
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Hi There, Zeroken09!
The cache that you are looking for is hidden in a discarded pile of wood, somewhere near the Guard's Tower in Felodrift!
There appears to be a missing part of the quest that was supposed to direct players towards here.
We have noted this, and in the next update this quest will have a better series of descriptions for each stage!
Thank you for your question, and thank you for supporting us!