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To purify a zombie you throw salt into his/its mouth; When their shadow is stolen, the original owner will go into a coma for about 3 days. If the original owner dies, the shadow dies as well; 5 years ago Brooke lost to Ryuuma at Thriller Bark; Franky asks Brooke's reason to keep on living and is touched by his answer and starts crying; Brooke confronts Ryuuma, saying this time he will win and sth like "the flesh is different so it seems impossible"; (not too clear the meaning here) In the past Moria lost to someone in the New World, for that reason he's been searching for strong body/shadow since; In a northern continent he found a satisfying body, he's been waiting for a shadow worthy of this #900 ever since;
Seems by end of the chapter we will be granted a glimpse of 900, which is a huge monster currently stored in a heavily locked frozen room.