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The power of the Dao of Yin and Yang was mystical, it was able to share its powers with all of Veronica and Ervas allies as long as they had a connection with him, and through gathering and refining these essences, they were able to grow explosively stronger.
Over time, they cultivated these powers and gained great power, and now, they were using such strength to infuse it into the split souls, the two that had been helping them through their lives since the moment they met them.
Some were created by them through their power of necromancy of life, but others were found by them along the way, and through their help, their lives became better, as they were given the help and the strength to fight against their own fates, and the many enemies they encountered along the way.
Check "The Protagnist's Sister Is Actually the Strongest"!