Chapter 519 Spoiler Summary
Courtesy of Anonymous Poster on 2ch.net and our translator, Patches.
Inuyasha v53 ch519 "Magatsuhi's Shadow" (Magatsuhi no Kage)
犬夜叉 第519話 「曲霊の影」
Kagome wakes up. Kohaku is still asleep, and when she tries to purify his shard, she can't. It seems that when Magatsuhi laid his eyes on her, she lost her power. Sesshoumaru receives a sheath for Bakusaiga from Toutousai, and leaves Kohaku, Rin, and Jaken to go off on his own. Toutousai says that because Magatsuhi is not a being of this world, Sesshoumaru is the only one who can kill him.
Switch to Naraku. Though the body he lent him has been destroyed in its entirety, Magatsuhi is not dead. He tells Byakuya that he has a guess about what he's going to do next.