User blog comment:Gabrielaaloo/Shedim/@comment-31057575-20180509094209/@comment-3169324-20180509094936

It's technically possible that they're just "special cases", if they're demons. Asmodeus said they were "Hell's most savage", so they could just be the most evil humans to have ever walked the Earth, who later turned into the most savage demons to have ever existed. On the other hand, he also said "creatures", which makes it unlikely they're actually demons.