Tōshū

Toshu is swordsmith who was supposedly forced by Ryūjin, a humanoid dragon, into forging the demon sword Dakki from his own scales. To remind him of the deal, he gave Toshu a mark on the right eye. Fearing for his own life, Toshu attempted to forge Dakki, with many failed attempts. Inuyasha and his group protected him and defended him when Ryujin came for the sword. When Ryujin was defeated, he plunged Dakki into Ryujin, allow it to consume his youki and become a yōkai sword. It was then revealed he was the one who offered to forge a sword for Ryujin. He met his demise when Dakki, afraid of breaking, instead let Toshu's entire body take the damage, thus killing him.