Victor had decided long ago that to survive in this harsh world, he had to stop being a human. A normal human is weak, and are prone to the will of the powerful. So he replaced his human organs with mechanical ones, using all kinds of rare ores, and technologies to mimic their power. At one point in time, he even manage to become stronger than most of them.
They even began to invite him to their circle, but his hatred towards them was too deep. He was disgusted and fought them to the death. That was when he realized that he had shed his mortality.
There was advantages of modifying himself. First, he was hard to kill. Second, he did not have to rely on external devices to do his bidding.
But, there were also disadvantages. Because the strongest weapon he had was himself, he couldn't help but had to make a move on his own to take care of some problem.