Starting as a Little Python, I Swept the World of Martial Arts

In his senior year of high school, Chen Xu turned into a snake. A small python as big as a palm. His parents kicked him out of the house with a broom. The whole town thought he was dead. Then he discovered that he could evolve by swallowing mutants. Devour F-class mutant rats to unlock heat sensing. Swallow the D-level wire centipede to unlock the poisonous fangs. Swallow the C-level blood mantis to unlock bloodlust. The more he swallows, the stronger he gets. In the sewers, the forbidden zone for mutant beasts, and the gene bank of the Evolutionary Academy, he swallowed himself into a beast that surpassed the S-class in one bite at a time, in front of the eyes of the whole world. Until the S-class beast wave swept across the city, the army was defeated, and the evolvers died. The live broadcast camera was focused on the ruins, and tens of millions of people saw with their own eyes a thousand black dragons rising into the sky and swallowing the S-class beast king in one gulp. Then the black dragon transformed into a human, stepped on the Beast King's head with his bare feet, and said something to the camera. "Mom, I'm back."