When Lin Chuan reached the fourth tier, before he even had time to unleash his soul-cleaving blade to shatter the surrounding pressure, a massive force almost pushed him right back out.
To withstand this pressure while refining two types of Grade 2 Heavenly-tier pills was undoubtedly as difficult as ascending to heaven. Therefore, even those who managed to stand firm on this tier ultimately chose less demanding Grade 2 Heavenly-tier pills.
Lin Chuan glanced at Hanyue and saw that she was already struggling slightly on the third tier. It looked like the fourth tier would likely be her limit.
Chapter 634