The only thing that prevents players from exploring certain areas are the levels on the enemies, not because they don't want to or think they won't get a reward for doing so. There was an area north of the Forgotten Shores that I wanted to explore, but the "??" and immune enemies prevented me.
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Really? I made I past them plenty of times.
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There was still at least a ghost or loot chest you could have gotten in the grottos. Yeah the ?? Enemies were there but if you just tried to avoid them it is possible.