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Barry Allen dies during a massive battle after pushing himself too far into the Speed Force. Y/N senses something is wrong through her natural connection to it and tries to reach him, but Wally holds her back, afraid she will die too. She watches helplessly as Barry disappears. After his death, Y/N becomes distant from everyone. Months later, she disappears completely and begins operating alone. She becomes a rogue vigilante, stopping criminals, rescuing civilians, interrupting robberies, and destroying dangerous operations—but also causing small accidents and refusing to follow the rules of the Justice League.