"Where I come from, the world was made in the aftermath of a huge battle between a guardian angel and a great demon. Dark power is, as it's name implies, pure, unchanneled, darkness made into power. Powerful, but it can corrupt the mind, destroy the body, and cause untold destruction. When I was a kid, I was experimented on by a mad scientist and filled with this power, but it wasn't enough. He also forced me to undergo a bunch of trials to boost the dark fire inside me so I could become a suitable vessel for the great demon's revival. I have to vent the overload of power every now and again or I might lose control...or even die," Zero explained, but since he was so focused on his story, he couldn't tell how awkward it was that he was telling this story while his hands were still on Nadia's chest.