Immeasurable Ruler

It was previously called the Infinity Sai. It was a top-grade Doctrine Artifact and was a black ruler with a rectangular shape. It didn’t seem like a weapon regardless of how one observed it. But, as a matter of fact, this was really the case. The Immeasurable Ruler was made out of unique materials, and it wasn’t sharp, nor was it heavy like blunt weapons. Everyone believed that it wasn’t suitable for offence. But since it was a top-grade Doctrine Artifact, it possessed an amazing trait—it could grant immunity to all of the world’s poisonous substances. This was why it was given in the past to Jiang Chen who couldn’t cultivate. However, the Immeasurable Ruler’s function wasn’t limited to just this alone.

Jiang Chen is able to change it's form to a spear and a sword.

Later it's power became to the Immortal Artifact level.