Reborn as a Snake, I Turn into a Dragon by Swallowing It!

Begin as a snake and evolve by swallowing! I was reborn in a snake. Fortunately, I have an evolution system. I only need to devour other creatures to continue to evolve! Devour rats and get mutated fangs! Devour the bison and get defensive scales! Devour the giant elephant and obtain the Mouth of the Abyss! … From a small snake to a giant sky-swallowing python, from a python to a dragon, and finally from a dragon to a dragon, becoming the overlord of the world!