So'unga

The fang of InuTaisho, Inuyasha and Sesshoumaru's father. It contains an evil spirit in it and is also known as "The Sword of World Conquest." It appears in Inuyasha Movie 3:The Sword of World Conquest. It's attack is Gokuryuuha which means "Hell's Dragon." It is a powerful attack that looks like a purple spiraling windstorm. It's power is greater than the Tessaiga and the Tensaiga but if both are used the Sounga can be defeated.