Threshold: Edge of Black Barrier

The plane where humans are located is in the shape of a "horizontal narrow corridor" with a fixed height of 387 meters. The area beyond the height is covered by a "black barrier". Any matter that comes into contact with the black barrier will instantly melt without any residue. The length of the plane is unknown. The current deepest human exploration record is 1,279 kilometers. The front end is still filled with endless darkness and monsters.