Synopsis

The protagonist discovers his sword cannot handle his techniques and needs a rare metal called Frostiron, which is only available to higher-ranked individuals. He undertakes intense training by consuming Demonic Dragon Marbles, enduring extreme pain and injuries to significantly enhance his internal power and the strength of his sword techniques. He also learns advanced techniques from the Demonic Lord's sword art and counter techniques from a sapphire stone, pushing his body to its limits.