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After imparting the "True Solution of the Earth Star Vein," Star Lord Bai Shan had discussed many key points of this method with Li Yuan.
Each Life Star contains the essence of a creature's life.
To brand Star Marks on the surface of a Life Star is, in essence, to make subtle adjustments to the essence of each Life Star with powerful spiritual power and superb skill.
Of course, it's only an adjustment to the surface... and not a complete change of a star.
Thus, as long as there are enough Life Stars branded with Star Marks, once the Star Meridian is activated, these Life Stars will trigger a chain reaction... eventually unleashing inconceivable power.
This is exactly why.
A Star Meridian, as an entirety, under normal conditions, can only cultivate one Star Technique.