The Core of Pain requires his use to exert greater power. His Divine Core is the World Tree, a concept that can connect worlds, and only with such a property can it fully realize its potential.
Otherwise, the Core of Pain can only gather pain within a limited range, but with the World Tree, this range is expanded to 'worlds'. As for the Pointless Dice brought back by Wu Lingluo, use it when the chance arises.
Also, the items Julie returned with for Severing Heaven and Earth, let Lilith analyze part of it, while Zheng Yichen used another part to strengthen the Divine Core.
Overall, the effect isn't bad; it's not about completely severing the heavens, but rather focusing on a strategic severance.
For instance, regarding the World's Will's blessing, within the Severance, Zheng Yichen himself also has to bear its impacts. Of course, in this world, he won't receive any blessing from the World's Will, so severance is simply severance.
