“And during its completion He shall burn the house of dominion with fire, and all the race of the elect root shall be dispersed.” – Enoch 92:11
Nephilim are immortal creatures of sin. The most powerful corporeal supernatural creatures in creation with mastery over sin, superhuman strength and endurance and able to form alliances with demons in hell while swearing allegiance to the twenty one fallen angels who defied the will of god.
They just need it, you know? Just a bit. Like everyone else they need to be seen and harvesting even the smallest amount sin is the most visceral reminder of who the fuck they are.