At Hell Ledge, countless people from Darkness Port participated in the Hell Ledge Challenge before, but it still remained as the most mysterious place.
The only thing known about the Hell Ledge Challenge was that one must go to the third level of the cabin area and the stationed troops would bring the challenger across a long corridor into a mysterious place to start the challenge.
The so-called challenge was held in a large space. Everyone had different encounters in the space, and whenever one succeeded the first challenge, he would advance further down to the next challenge.
Someone once described the challenge as climbing an upside-down tower. The challenger would go down level by level in the massive tower.
Aside from the difficulty of the challenges, the reason why the Hell Ledge Challenge was mysterious was that no matter how familiar one was with Darkness Port, it was difficult to pinpoint the location of the challenge.