Death to Speedsters

Sonic would end up in an encounter with the Black Flash, only being saved because of an alternate version of him being caught instead of him. Sonic would ask Barry what the Black Flash was, finding out it was Death's answer to Speedsters, as Death herself can't catch up to them normally. The sight of an alternate version of himself dying at the Black Flash's hands would haunt Sonic, bringing new nightmares to his mind.

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Art of human Sonic by Rhael on Twitter