Does Sesshomaru only have one arm?

Answer 1

Yes, Sesshoumaru lost his left arm in episode 6. While in one episode he is given a temporary replacement for only the duration of that episode, throughout the rest of the series he only has one arm.

Sesshomaru's original form is a giant white dog with markings similar to those he has in his human form. In the anime, he transforms surrounded in a bright red auraor has a tornado circling around him. His eyes then take on a bright red color and yōkai marks on his body widen and become more apparent; the stripes on his cheeks which are usually smooth become jagged and change into a somewhat fiercer color. In the anime, he has acidic saliva and in his breath spreads poison in the form of mist that melts anything nearby. He only fully transforms to his original form three times: during a battle with InuYashawhich results in the loss of his left arm, when he meets his mother, and during the battle against Magatsuhi which eventually leads to his arm regenerating and the formation of his sword Bakusaiga.

Answer 2

That hasn't happened in the anime yet. If you want to keep an eye on Inuyasha: The Final Act to see, you can watch new episodes at shonensunday.com. He got his arm back in chapter 518 of the manga.

Answer 3

Episode 6

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Answer 4

In episode 17 of InuYasha: the Final Act.