Nekron

Nekron is a comic book supervillain appearing in books published by DC Comics, specifically those related to Green Lantern. Created by Mike W. Barr, Len Wein and Joe Staton, the character, who exists as an embodiment of Death, first appeared in Tales of the Green Lantern Corps . He is the primary antagonist in the Blackest Night storyline that was published in 2009 and 2010.

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Source: Wikipedia