Where did the concept of descendants of Nuwa first come from? Is this a China myth? Or an online novel?

It was first set in the series "Legend of the Sword and the Chivalrous Man" 1.

Nu Wa, also known as the descendants of Nu Wa, is a unique setting in the series of stand-alone games of Legend of the Sword and the Chivalrous Man.

Nu Wa is a hybrid of man and God. It is the descendant of Nu Wa, one of the three ancient gods, who was banished to the world. Belonging to demigods and demigods, the spiritual strength is higher than that of ordinary gods when it breaks out. The snake body is the demon body that Nu Wa left to future generations after being defiled.

Under normal circumstances, life will never be old, but like other gods, if they reproduce, they will gradually wither like ordinary people, and their spiritual strength will gradually weaken and age, and finally their spiritual strength will fail and die. After the death of Nuwa people, their souls do not enter reincarnation, but belong to the Holy Spirit Beads. Nu Wa's descendants all bear a heavy fate, and they died in martyrdom generation after generation, and they all came to no good end. Although the Nuwa nationality was slandered as a demon by the heaven and regarded as a heresy by the people of the Central Plains, it was a descendant of the protoss believed by the people in Miao areas. They carry on the legacy of Nu Wa and protect their lives from generation to generation.

So the source of the concept is neither a myth nor a novel, but a fairy sword game.