Infinite Devouring: Starting with a Blue Stone

[Beast Transformation, Ordinary Protagonist, Slow Burn] Shen Li transmigrates into a rock on a cliff, but luckily, he has an Infinite Devouring System. [The System is only a helping hand; this is an ordinary-protagonist story] Devour spirit stones to refine spiritual energy and speed up cultivation! Devour black iron to make your body indestructible and withstand magical treasures! Devour the remains of demonic beasts and even steal their innate abilities! Even… devour a cultivator’s magical treasure and claim it for yourself!