Not sure if I'm the only one who is paying attention to it but in the Black Garden we have two paths, one to the heart, and the other to a pathway cut-off by a barrier. Does this barrier being there mean we will be heading back to the Black Garden in one of the future DLCs or is just permanently cut-off for no reason. I know the there is stuff back there since I see pathways through the barrier. But what could be back there?
Comment below on what else you think is in the Black Garden.
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It is most likely open in another quest. There are many areas that are blocked in specific quests to keep you on target. But on Patrol you can see they are all open (as far as I have seen). Not 100% certain the one you mention is used in another mission, but that is what my money is on.