There are a number of ways to reach The Concave; it seems that falling is one of them, but falling from where?
For the people of Kuboloth, hell is not in the depths of the earth but in the cold of the windy air;heaven is in the warmth of the earth, lit by glowing jewels.
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One way of getting here, The Concave, is through conflagration of your Soul. Not a nice way to arrive, but at least you'll have the benefit of a guide, unlike most others.