Traveling through Douluo, you start with a Pidgey martial spirit, and see how Mo Hui, through training, makes Pidgey evolve step by step into Pidgeot, and finally into Mega Pidgeot.

The first soul skill: Air Blade.

The second soul skill: Lightning Flash.

The third soul skill: Tailwind

....

No system, look at the original characters objectively.

Yang Xiong, an ordinary person from Blue Star, was reborn in Douluo Continent. His father was the outer sect steward of the Seven Treasures Glazed Sect.

He awakened his body spirit, but was not favored by everyone. Yang Xiong was overjoyed, because he knew more about the power of the body spirit. Even if it was just an ordinary body spirit, with an ordinary innate spirit power level, it would make him more low-key. Moreover, through endless body training, he would eventually reach the pinnacle of the spirit master, and be on par with the gods in the heavens with his mortal body.