Time Wraiths

A Time Wraith is according to Eobard Thawne a being that appears when a speedster travels through time and attempts to change history. One appeared when Barry traveled through time to learn how go faster from his former mentor and enemy the Reverse Flash. It seems they can be avoided as Eobard claimed he had been careful and that only amatuers get caught adding that Barry was lucky the first time he time traveled.

Biography
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Tivia

 * Despite hating time travelers they have yet to appear on Legends of Tomorrow.