Dissolusion
The outer edges of the map are dissolved, not burned, just simply flickering out of existence.
Beyond the edge is no more, outside of existence. The interior is solid, predictable.
It's at the edge the mysteries occurs, disillusioned. Not because there is a lack of hope, but the next step simply doesn't exist. It materialize when you take the ext step.
Why is all ao Grey and blue, where did all the color go?