Martial bone is a peculiar object that emerges after stepping into the second stage of practice, having replaced mercury blood, and developed silver marrow.
It is like a sapling being watered; after robust growth, occasionally it may due to various reasons, develop extraordinary variants.
For instance, those proficient in horizontal training exhibit "tiger's back and bear's waist," possessing natural vigor and extraordinary bravery.
Those skilled in body techniques and lightweight skills have "Flying Swallow Step" and "startled swan foot," with graceful postures and agile strides.
The Daoist Official of Yuanyang Temple in Yihai Prefecture once specifically wrote a "Root Bone Record" to document various martial bones considered strange and diverse, classified into upper, middle, and lower grades, ranked by order.
The lower is of bronze and iron hues, the middle of gold and jade hues.
Only the upper ones can radiate brilliance like a treasure.
