The fourth physical body: a life level of 10,000-fold.
If we categorized the first four physical bodies uniformly, they would fall under the universe-level Special Life Form category.
The upper limit of a universe-level physical body was 10,000-fold, and the lower limit was one time.
For ordinary human cultivators, adulthood represented a life level of one time. To increase this required postnatal effort, but no matter how much effort was exerted, raising the life level of the physical body to 10-fold was typically the limit.
Further enhancements mainly relied on treasures.
For instance, the entire body of a Special Life Form was a treasure. The simplest and most straightforward method was to use the blood of a Special Life Form as a reference, dilute it, and merge it with one's physical body.
