Descendants or Mutants?
Sam was intrigued. The people in front of him are clearly humans, at least they look like that but their inability to cultivate the techniques, spells and battle skills is something very similar to beasts.
The spells and battle techniques are used by circulating the spiritual energy through a particular set of meridians in a pattern exclusive to that technique.
Humans after unlock these meridians in the initiation stage and after that with the help of cultivation techniques they use, they would be circulating the spiritual energy in particular pattern for further breakthroughs.
But the beasts are different.
For beasts, there would be a particular set of meridian patterns already activated based on their genes which are decided by their birth and bloodline.
The genetic memory itself is responsible for their easier cultivation, breakthroughs, their skills of attacking, defence, movement etc.