Just downloaded Ch4 and I have no idea what to do to progress, I've got the sword from the ruins with Pylia, is there anything else to do? I have never seen the "Dream World" that people talk about in this thread, nor the recollection room. I've got all the 18 succubi from Ch3 done (I think that was all of them) and I haven't been able to find an exit on the Underground Grove. I may be just stupid but I can't find a way forward. I can see this Demonic Ruin on fire which I could not before downloading Ch4...
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...but I can't get to it because the Underground Grove blocks the path...
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I'm probably stupid but I need help lol