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I looked at the map – I also played as humans. I explored almost the entire map, killed enemies in the lower-left corner of the dungeon, and I think something happened there. I didn't save, so I can't remember exactly, either some condition wasn't met, or the teleport didn't return me, or maybe I wasn't prepared enough for the encounter – in short, I hit a dead end. But I remember concluding that I needed to go back many days and follow a different path, and do it faster. This is more of a case where the map isn't impossible, but rather that replaying it felt tedious. Apparently, I needed to stick to a specific order of actions, rather than wandering around the map randomly.