Harmonized Fruit Pill involves planting a baby into the soil as spiritual material.
During childhood [budding], the flesh and blood will grow like plant roots and stems. In the Weak Crown Period [branch hanging], bones and internal organs allow pill cultivators brief moments away from the soil.
Only in the Core Formation Stage [transformation] can pill cultivators gain full freedom of movement.
At Guodan Mountain, if cultivation stagnates before the Core Formation Stage, pill cultivators are refined into elixirs and sold by the sect.
The direct lineage's [Body Refining Blood Technique] is different; it doesn't require burial in soil.
It doesn't restrict by age nor require children to start cultivating. Even elderly individuals in their seventies or eighties can practice.
However, Body Refining Blood Technique consumes too many resources.
Li Mo noted that a top-grade spiritual material called [Huanluo Fruit] is the key to entry for the Body Refining Blood Technique.