This treasure had only one function.
Its only function was to be used when a cultivator attempted to break through to the Foundation Establishment Realm—the moment they drew upon the Power of Heaven and Earth and endured the assault of the Xun Wind, a force powerful enough to scatter the soul and shatter the Dao Foundation.
It weakens the power of the Xun Wind, greatly increasing the success rate of Foundation Establishment!
What was even more incredible was that even if the breakthrough failed, the pill's protection could keep the Dao Foundation from dissipating.
This gave a cultivator a second chance to attempt the breakthrough, preventing their path from being severed and saving them from the annihilation of both body and soul.
It could be said that this Wind-Still Pill was even more precious than a suitable Foundation Establishment Object!
