For hundreds of years, demons have been wreaking havoc on the world, and the people have been miserable. In the Lieyang Volcano, there is a special metal called Xuan Iron, and weapons forged from it have a miraculous effect on demons. However, the human body cannot withstand the powerful energy of Xuan Iron. Therefore, many warriors came to the Lieyang Volcano to slay demons and eliminate demons. Here, they cut off their own arms and installed prosthetic limbs forged with Xuan Iron. They were called "Demon Sealers". The Demon Sealers have amazing combat power, but the power of Xuan Iron will still backfire on the Demon Sealers. So as the demons were eliminated, the Demon Sealers became a thorn in the eyes of the people and had to hide their identities. Suddenly, an accident made them discover that the demons were reborn. Through in-depth investigation, they learned that all this was a conspiracy against the Demon Sealers. The so-called slaying of demons and the so-called justice for the heavens were lies from the beginning...