Note: The plot in the first two chapters is very important, don't skip it! The storyline of breaking through to Sub-King in this chapter is also quite significant.
...
This situation, Lanling had encountered before.
There was an enormous amount of energy gathered in his body, but lacking advanced energy attributes, he couldn't break through.
At this moment, the energy within Lanling's body was extremely abundant, even astonishing. After all, it had devoured as many as five thousand Shadow Demons, all filled with Demon Saint Layer energy.
So how to break through to Sub-King?
It should be simple: just defeat the boss of The Ninth Layer of the Trial Secret Realm.
Previously, each layer of the trial had a boss, including the second layer. That Ice Queen was the boss, but since Lanling killed it halfway through the trial, there was no battle on the darkness platform leading to the third layer.
