Who is the Black Flash?
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The Black Flash is a supernatural agent who acts as the "Grim Reaper" for speedsters. His existence is apparently tied to the Speed Force. Because of this, he appears shortly before the death of any speedsters. He is one of several aspects of death, including the Black Racer and Nekron. Barry Allen is seen briefly becoming the Black Flash in The Flash: Rebirth. Black Flash was created by Grant Morrison, Mark Millar, and Ron Wagner, first appearing in Flash (Volume 2) #138. (1998)