Chapter 523 Full Spoiler
Courtesy of Anonymous Poster on 2ch.net and our translator, Patches.
Inuyasha v53 ch523 "Sango's Wish" (Sango no Negai)
犬夜叉 第523話 「珊瑚の願い」
Sango: "Kohaku… woke up!"
Kohaku: "Ane-ue… now… even now, there's still time?"
Sango: "Yes, there's still time!"
(If he can drive Magatsuhi out completely…)
Kohaku: "Magatsuhi… you're coming with me."
Magatsuhi: "How interesting. Do you intend to drown yourself? Do you think that would separate me from you? Even if you smash your body upon a cliff, I will still be able to manipulate the piece of your body surrounding the shard."
Inuyasha and Sango will take his shard, so Magatsuhi won't be able to claim it, figures Kohaku as he throws himself from a cliff.
Magatsuhi: (Damn you… I'm being pushed out… Kikyou's light that transferred to his shard is giving him power…?!)
Magatsuhi is detached from Kohaku. Inuyasha and Sango go to save Kohaku, but Naraku's tentacles get there first. While caught in the tentacles, Kohaku tells Sango to cut them. Inuyasha figures Naraku must be at the root of the tentacles, so fires off Meidou Zangetsuha. However, the presence of the polluted jewel is still there. Kagome says Naraku is still alive.
Kohaku is still caught. Magatsuhi: "You lose."
Then Sesshoumaru appears holding Tenseiga.
…………….. Miroku needs to live and I coudn't tell what was up with Rin.