They could create an achievement in which it specifically keeps count of how many supple branches you gather or whatever gathered item you have like let's say
-Gathered 10k Supple Branches
-Supplied x hamlet with 2mil worth of points
-Supplied y hamlet with 2mil worth of points
-Supplied z hamlet with 2mil worth of points
-Successfully defended x y and z hamlet.
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It would prolly be tougher but it would be nicer if said rewards were actually designed with DOL in mind and not just a random award that anyone in the group has a chance of getting.