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The monster is a black, big puff of smoke that is known as the Smoke Monster (The Man in Black).

Further Explanation:

Danielle Rousseau called it a security system, and it was confirmed this season that it can take many forms, including human form. Currently, he/it is posing as john Locke, and has in the past taken the form of Yemi (Eko's brother), Alex (Ben's daughter), and Christian (Jack's father). He/it was also the unnamed character known as The Man in Black, Jacob's nemesis and/or his brother, as seen in the opening scene of the S5 season finale. He can be "called" by others, and seems to pass judgment on others (as seen with Eko) and often kills people in Smokey form.

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15y ago

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