Chapter 603: Making Strides

Superior-grade Spirit Artifacts were extremely rare.

The Sword of Essence Restoring was extremely deadly, but it was only of inferior-grade. Chen Fan could only create a mid-grade Spirit Artifact using the Thunder Seal as a core and added the effects of many divine artifacts.

That being said, the Five Thunder Seal was created using the refinement method of Immortal Cultivators, so even though it was a mid-grade Spirit Artifact, it was no less powerful than a superior-grade one. A superior-grade Spirit Artifact was beyond the reach of most Connate cultivators. Only those who had reached the peak of the Connate Cultivation and were from major Immortal Cultivation sects could have obtained one.

As for Spirit Treasures, they were even rarer.

What made a Spirit Treasure much more powerful than Spirit Artifacts was the Artifact Spirits.