The Marrow-Cleansing Pill is one of the most inferior Spirit Pills, not considered a remarkable treasure.
In a sect like Kunlun's Immortal Sect, they have the ability to refine Marrow-Cleansing Pills for their disciples.
The efficacy of the Marrow-Cleansing Pill is quite ordinary, purifying the marrow and eliminating impurities in the human body to make cultivation faster, while also somewhat enhancing physical strength.
It's a common medicine within Immortal Sects, but within smaller sects, it's extremely rare.
Because small sects have limited resources, it's difficult for them to produce Marrow-Cleansing Pills.
While for Immortal Sects, whether there are thousands of people or millions, gathering the materials for Marrow-Cleansing Pills is far too simple.
The Marrow-Cleansing Pill created by the Rebirth Ring, however, is different from ordinary ones, as the Spiritual Energy and medicinal power it contains are tens of thousands of times that of a normal Marrow-Cleansing Pill!
