A Night-Child, made by Terrance. While usually, only those humans who can handle the transformation are chosen, in this case, something went wrong.
Dain grew bitter over his transformation, but instead of seeking help or a healthy outlet, decided the answer was to try to expose the magical Mythos to the world. He did this by attacking children in a public place, counting on live-streamed social media to get the word out.
Terrance himself hunted Dain down, and it was an ugly end.