Forbidden is a demonic horse, large enough to walk under and black as night. He has a dark spiky mane, angular horns, and glowing red eyes. He has a standard equid penis, but it is much longer than average.

With the sins of the mortals growing, the demon lords needed a way to punish them effectively for the sins they committed... And thus, Forbidden was created. So taboo is his nature, that even whispering of his existence is seen as blasphemy. Forbidden is tasked with punishing mortals who sexually engage with animals. Standing well above them with a penis that reaches the top of his hooves, those who encounter him wish they had not... But unfortunately, they have no say in the matter.