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Throughout the entire cultivation process of the Dan Realm, everything revolved around the "Dan Ying."
The cultivation process of the Dan Realm was essentially a martial master using his own body as a blueprint, continuously absorbing the spiritual power from nature to grow the "Dan Ying," from a baby to a person.
When the "Dan Ying" grew into a "Dan People," infinitely approaching the cultivator's blueprint, it meant the achievement of Great Perfection in the Dan Realm.
At this realm, the older martial masters in the Dan Realm needed to nurture the "Dan Ying" to match their blueprint, which required several to even dozens of times more time and effort than younger cultivators, so the advantage of reaching the Dan Realm at a young age was significant.
If one failed to break through when young, it would be extremely difficult to do so when older.
