Synopsis

Jin is introduced to the Fourth Battle King, Rinfa, who is in 'no-speech' training and will teach him the second form of the Shadow Sword. He also learns that the Fifth Battle King, Boras, is a master blacksmith who gifted him a molar, unlocking hidden potential. Through Boras's unconventional and 'boorish' training, Jin develops a jewel heart of aura similar to the Myungwang, a feat not previously thought possible, marking significant advancement, although it is advised that he keeps it a secret for now.