The Nephilim are giants bred by Morgan le Fay to do her will. By planting the seeds of Samyaza in the Third Circle of Hades, she was able to mass an army. The seeds grew into humanlike plant forms with a head, arms, and legs. When it was big enough, it would be uprooted and taught to walk and hate. It would then grow bigger until it was larger than any human. All of them (except Yereq) are ruthless, love to cause destruction, and serve Morgan and Mardon's orders.