Inuyasha The Final Act Episode 9: Sesshomaru in the Underworld

Without his jewel shards, Koga takes his companions and retires from the fight with Naraku, leaving desire for revenge to InuYasha and his group. Meanwhile, Sesshomaru visits his mother to ask how he can make Meido Zangetsuha even stronger and even more powerful. She summons a HellHound for him to battle, which takes Rin and Kohaku into the void of the netherworld. He follow and defeats the beast and rescues them. Though Kohaku is able to move within the void because of the Shikon Jewel shard, Rin is not. When Kohaku informs Sesshomaru that Rin isn’t breathing, he stops shocked. The darkness of the Abyssal Void envelopes her and Sesshomaru confronts a guardian of the dead, but Rin dies. Sesshomaru is disturbed to realize he is not sure Tensaiga can revive her again. His mother revives Rin using her own Meido stone, but warns that neither Rin nor Kohaku can be resurrected by Tenseiga again.