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The One and Chaos had come to met Veronica, Ervas, and Aurora, and had told them why they couldn't communicate with them before!
It was because they were not able to find a connection through their Origin into their Origin, this was because their true Origin was within the World Cores of Kritias, both of them.
Now that they finally got them back after devouring one and fusing with another, they had gained
a bit more of their true selves in the process, and these two entities were able to communicate with them once more.
The One had gone through some changes on his original nature, this was due to Kireina herself.
Why? It was because The One was an aloof and nihilistic god. Despite how he was portrayed in Christian Religion.
Because he knew everything, he wasn't able to properly find entertainment and fulfillment to life, he wasn't able to find any other meaning than just existence itself.
Check "The Protagnist's Sister Is Actually the Strongest"!