Board Thread:Questions and Answers/@comment-5441128-20171007200634/@comment-27610757-20171130163926

Spirits, demons, whatever you want to call them. Non-corporeal entities generated by the Spped Force or I guess maybe made of Speed Force since similar to how Gypsy can cut off a speedsters powers, sonic frequencies can destroy Time Wraiths. I'd say they can't really be former speedsters since then they'd be more like Zoom.