Episode 171

Dragon-Scaled Tessaiga is the fourth episode of InuYasha: The Final Act.

Plot
Inuyasha's group rescue a swordsmith named Toshu from the demon Ryujin, who is angered that To shu has not completed crafting Dakki, a sword designed to absorb other's demonic energy. Toshu later uses the sword to absorb Ryujin's power, the battle Inuyasha and steals the demonic energy from Tessaiga. However, the demonic energy is too powerful and kills him. The energy of the sword returns to Tessaiga, giving the ability to absorb demonic energy. Meanwhile, a wolf-demon named Kai tricks Koga into helping him, seeking a jewel shard to rescue his younger brother from a demon named Byakuya, one of Naraku's incarnations.