D-Day

D-Day is a global event that was tragic, it was the day demons stopped hiding in the shadows and showed themselves to the world but they weren't on the humans side, some were on the humans' side, those who were got executed by the demons who hated humans D-Day was the day that changed everything and an evil demon called Overlord led the attack on humanity

It inspired Curnal Clark to form Helix after he saw his wife tranformed into a demon and human hybrid in his own house