One day, the world was suddenly tormented by a high concentration of frequency wave unheard by human ears. It was detected by radios, TVs, computers, and etc. But a few people had heard it. And those that did suffer from a mild migraine to an unbearable, head-splitting pain that was followed by vomiting of blood and uncontrollable hallucination.
After a day of suffering, those affected became monsters; monsters with an appetite for humans.
But—there were also those that became . . . something entirely else. . .