Ok so today I got a bounty to go back into the Black Garden and whenever I got about halfway through I came the room where you have the kill the Decisive Mind to bring down a barrier, that had a wall taken out of it towards the right of the room that I hadn't noticed before and in that room I found a door with a barrier that I couldn't get through, not sure what its about possibly a zone for the next expansion? Also has anyone ever thought of the fact that the location where Crota's Throne room and the Bridge are in Crota's End look a lot like the Black Garden with the green lighting and the red flower petals everywhere? Also if you play through the Black Garden mission you can see a huge canyon beyond the heart and I think that is the Oversoul from the raid. Let me know what you guys think I think that this is really interesting.
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Pretty sure the wall in the black garden has to do with the Taken King. You do missions to get your third subclass and the hunters is in the black garden. Titans is on mercury. Not sure where the warlocks is though. Maybe somewhere in the Crota raid?