Soon after The Beginning, God made the Angels. He made them because he wanted to be loved, to be adored, and they certainly did. But, He thought, how could they not? To be in the presence of God is to love Him, pure and simple. How much of their love was actually real?
So He came up with a plan. He announced that He was going to create a race of sentient beings on the Earth - Humanity - and let them decide their own destinies. He wanted to see if they would love Him too.
Half the Angelic Host went mad on the spot. They knew that any world that was cut off from the direct presence of God would descend into chaos. Earth would become a charnel house, and all of humanity would suffer. To their minds, it was a cruel and wasteful thing to do. So they rebelled.
The fighting was horrible, with no quarter asked or given. Finally, the rebels were ejected from Heaven, and landed in Hell. First among these was The Devil. Lucifer. Satan. Nick.
The Devil managed Hell, the kingdom of the Damned, where those humans who died in sin were sent for their eternal punishment. Usually, their humanity was burned out of them by their approach to Hell, but there was one man, an ex-soldier, whose hatred was so strong and so cold that it could not be destroyed. He had a heart cold enough to freeze the fires of Hell itself.
The Devil tried to beat the hatred out of him , to whip it out, but torture was ineffective. It was Angel Of Death who came up with a solution. Since all this man wanted to do was to kill, he could take the place of the Angel. His swords were melted down and remade into guns while the Devil sewed the meat back to his flesh. This man of hatred became the Saint of Killers, with guns that never missed and always killed.
As soon as he stepped through the gates of Hell, the fires started up again. The Devil shouted with joy, he shouted to the Saint, "Good riddance, you cold-hearted son of a bitch!" The Saint heard the insult, turned around, and put the first shot of his new guns straight through the Devil's head, killing him.