Sō'unga

Songa is a fictional sword in the anime and manga series InuYasha. It is the opposite of Sesshomaru's inherited sword, Tenseiga, "the sword of life or heaven", and Inuasha's inherited sword Tessaiga, "the sword of death or earth".

Songa, "the sword of hell or of world conquest", can summon 100 dead souls in one swing. In the third movie of InuYasha, the combined powers of the Tessaiga and the Tenseiga succeeded in defeating Songa, which was stronger than either of them alone.

Songa, unlike the Tessaiga or Tenseiga, was not created by Totosai from InuYasha's father's fang and it is unknown how InuYasha's father came to own it. Also, unlike the other two, Songa has a mind of its own. When held by a human, Songa takes control of them, and they will kill everything they possibly can, but when held by a yōkai, then Songa will try to persuade them to do its bidding. But InuYasha's father never let Songa control him.

When InuYasha grasped Songa, he was taken over, but regained control for a short period of time.

Special attacks and/or abillities

 * Dragon Twister: Songa most powerful attack, and more powerful than Tessaiga's Backlash Wave, Songa summons a large, violent, and powerful tornado that destroys, or kills evreything in its path.
 * Sheath of Songa: Kept Songa dormint for what seemed like 1000 years. Advised Myoga and Totosai to throw him with Songa sheathed into The Bone-eaters Well.