The identity of the Unknown Monster

Start the quest talking to Blood Magistrate.
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He wants to know what you have learned, so, when you are ready talk to him again.
He will make you a question, the exact answer is:

Even if a turtle can live the longest life, it must eventually die. <--note the detail as possible.!!

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If your answer is correct he will give you 1 Red Beed, show it to Ghost Shadow.
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Then Give the Red Beed to talk to Soul Catcher and complete the quest.
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