There were evidently fewer criminals on the fourth layer than on the third.
Spiritual Energy was thin but the region was hundreds of times larger. It took Zong Shou a full 4 days to find the entrance.
This place was different from the previous two.
It was a world wrapped in flames with magma all over. When one exhaled, one would give out flame energy. There were only a few rare places that could support life.
Based on what Lu Wubing said, this was called the Magma Fire Death Jail.
This layer was where the Lu Family punished their Celestial Realm Cultivators.
In this jail not only was it tough to survive, every midnight one would go through a technique similar to the Marrow Burning Blood Spirit Curse.
The only thing was that the Marrow Burning Blood Spirit Curse used the lifeforce and energy of the Lu Family people as fuel.
In this world, what was burned was the marrow and Vital Energy of the criminals itself.