The Iron Eater Bone Artifact was one that was developing spirituality and was already bonded to Lin Fan, so it had the ability to return to his hand whenever it was thrown away from him.
It had been unsummoned once it created that crater in the ground, entering a void state that allowed it to return to Lin Fan before it was summoned once again.
Lord Yin looked at the weapon in Lin Fan's hand with a bit of fear, especially after how casual Lin Fan had looked when he released it.
After this fact set in, Lord Yin suddenly realized that he had been a fool for thinking that he could match Lin Fan if Lin Fan didn't have his weapon. The fact that he had sent out an attack on that scale so easily, it was clear that Lin Fan was still holding back.
If he wasn't careful, he might not be able to escape with his life today.
Or to put it in other words, if he didn't have the rare laws of shadow, there wouldn't be a chance for him to escape.