On the big stage, the method of human sacrifice to cultivate has a low entry, but limit too.
In such a way even evil-natured sects even avoid this practice of using human blood as a resource since they know the impact it has on people's spirits.
In the witch clan, the altar has used as a medium to eradicate some of the effects, and thus their bodies are also very strong from having refined blood energy.
This energy is very useful in recovery, especially among those below the level of supernatural power that Wang and Ruruo practice.
The body after all depends on it more than Qi, and to a certain extent, bloodline affects longevity.
The case can be seen among monsters and warriors, even those in the same realm tend to live different lifespans.
When a dragon is just new to the world, it might take several hundreds of years before it could even step on the path of practice.