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Veronica and Ervas explained that the Daos were a mystical power that was also somehow an item-like power and could be divided into fragments that could eb shared with everyone that the wanted.
After getting a fragment, they immediately began to comprehend it automatically. The fragment would grow bigger the more they comprehended the Dao behind it, until it was to finally form into a Full Dao of its own to boost everyone's power even further.
Through this way, they would be able to grow stronger through the cultivation of this shared Dao and gain even more power. But of course, this was just the beginning, so it would take some time before they could completely comprehend it to its fullest potential.
Nonetheless, the split souls were already planning to do something with the other system points they have, as the System had suggested them something.