Master Ye was staring at Yuan in shock.
The slim young man had been excited as he spoke and his elders were not far behind him but then awe took over as they understood what they were told. The pill recipe was profound as rather than strengthen the dantian, it made it easier to shatter the Sky Core!
The most dangerous step to advance to Star Tier was to shatter the Sky Core into tiny shards. The way to do that was to absorb an obscene amount of Qi to intentionally make it burst without breaking the dantian shell.
That last part was the danger. If the cultivator shattered the core incorrectly and broke their dantian, they would be crippled. Worse, they could die instantly.
The force of the shattering was the problem but the pill Yuan described solved it elegantly. Rather than force the crystal shards of the core to shatter by overloading on Qi, the pill would weaken the shards to make it far easier to shatter!