Another part of the reason was that Lin Chuan had started at an exceptionally high baseline when he cultivated the Swift Divine Art.
However, this had both advantages and disadvantages. The downside was that later on, the difficulty for Lin Chuan to condense more astral seas would increase exponentially.
Back then, the sect master of the Heavenly Yin Sect could only open up the fourth and fifth astral seas using his divine soul; wanting to open the sixth astral sea required even more Golden Sovereign divine souls.
Chapter 1222