I've stacked already 5 of these Adventurer's Journal's, but I can't seem to figure out what for are they used in RoS. Seems odd, that there can be some item in the game, that has no purpose whatsoever.
Diablo – What are Adventurer’s Journals for
diablo-3
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Best Answer
The Adventurer's Journal used to be a crafting material for the Pender's Purchase legendary item, but it was no longer made a required crafting material with patch 2.0.6. More information here.