Immovable Object, Unstoppable Force

when I had reached my 200th kill in prison everyone was afraid of me the guards were tired of it and the inmates looked at me like I was the alpha. They called me Abaddon or "The angel of Death." It was symbolic for the dark peace that I had brought to the prison by killing the trouble makers and putting the others in their place. I had no clue what bearing that name for so long would do to me. When I was 30 years old I had reached my 600th murder in Jail or as I liked to call it hell. A place worse than were I was. I remember all of their names. Even now I can't forget. It's like part of my brain has made a special place for all of the names of my victims. By 40 the government had started to train me saying that it was because I had killed so many and could be useful to them. They educated me while training me in martial arts and special ways to kill people. By 42 I was a super soldier and could disarm a bomb in seconds. They called me their best soldier and the man who could not be stopped. I was both an immovable object and and unstoppable force. By 43 I had went on twenty missions and assassinations with zero downtime in-between missions. I had realized that I was just their puppet and once I wasn't useful I would be eliminated. By 50 I was no longer useful with my kill count reaching into the thousands. To prove myself they made me kill a whole civilization of people I think it was called Avalon. I felt disgusted killing so many innocents.