In the Plane of Dreams, aside from the Siren's natural evolution, all other living beings revolves around the bloodline.
With the Goddess of Creation as the seed of all life, and the subsequent evolutions were akin to steps. Anything that is the closest to the Goddess is the strongest and most perfect. The first batch of primal beings had apocalyptic abilities and were almost godlike, they too had the ability to communicate with the Goddess, while the Second Born were no different that humans on Earth, if a wee bit stronger, but their ability compared with the First Born was earth and heaven.
This bloodline could be used to determine an unknown species' 'birth' or their evolution period. Based on the information they had with the giant's unnnatural physique, Hao Ren boldly guessed that they are another form of the First Born, while not matching them exactly in strength, they are still a far superior race.
