I recommend "The Devouring Evolution of Reborn Worms". The protagonist of this book started off as a maggot, but there was a powerful devouring system that helped him eat worms, beasts, and dragon eggs. He could even evolve into Sin Kylin or the Heaven Covering Torch Dragon. In this dangerous world, he had to constantly challenge himself and become the strongest creature. I hope you like my recommendation. Muah ~