Zheng Yichen didn't bring back many substantial things this time, the most valuable being the ashes of the Great Evil God and the black liquid that flowed from the black moon; other than that, the rest were basically souls of Evil Spirits and knowledge from that world.
The power used by humans in that world was rune-based, and that power seemed to have some connection to the Great Evil God. While battling the Great Evil God, Zheng Yichen noticed some marks on his body that were similar to runes, which were also present on the God of Rebellion.
After comparing them with Lilith, Zheng Yichen became even more certain of this.
How special such power is can be left to more professional people to figure out.
