Mutation of Little Black

The fist-size stone felt neither like gold nor like wood. It was tangled by rings of hard lines, making it look like a pupa carved out of a rock. It was extremely heavy too.

Li Yao tried to spread his spiritual threads into the stone, only to be completely blocked by the shell.

He took out the dagger that he used to dissect demon beasts. Yet the dagger couldn't cut a single hole in the shell. The only thing it left was a shallow scratch.

Half a minute later, even the shallow scratch was gone, like a wound that healed itself.

Li Yao thought hard for a moment. Still, he didn't recall any material that had such odd characteristics.

He didn't have many tools at hand. Besides, he was not at a refining workshop after all. It might cause trouble if he caught too much attention. Therefore, Li Yao simply dropped the marrow stones and the pupa-like stone into the Cosmos Ring and decided to study them when he was back at the Grand Desolate War Institution.