Nolan is a young man, 17 years of age. He was the son of a wealthy businessman and his lawyer wife. When he was born, Nolan was diagnosed with a congenital insensitivity to pain. As a result, he is largely unaware of when he is hurt, but can still feel through the sense of touch. When he was seven, the Rust gang, a high-powered criminal organization in North America's underworld, sent a hit man to kill the family as retribution for the imprisonment of one of their own. He was only referred to as "The Closer". 
 
Nolan's family, including his younger sister and older brother, were killed, but he escaped with his life-barely. One of the bullets from The Closer entered his brain but didn't kill him. The surgery to remove the bullet was too dangerous, and thus it was left there. lodged inside his skull. Nolan then inherited the business and all money generated from his wealthy parents. Lacking the skills to lead the business, he only received a portion of the profits. His life deteriorating and lacking any purpose, he planned to commit suicide. He walked to a large bridge and prepared to jump off, but stopped when a car chase occurred on the bridge. Because of his lack of any sense of pain, he was able to rescue the passengers (although this severely scarred his back). Realizing that his curse could be used as a blessing, he donned a simple costume made of street close and became a vigilante. He used his considerable reserves of funds to fly in martial arts masters from around the world to train him in the ways of fighting, as well as skilled operatives from many countries. He became adept in the ways of combat.
 
Unbeknowst to him, the bullet in his skull had hit the area of his brain responsible for regulating his adrenal flow. As a direct result, his body is constantly pumping full  
of adrenaline, and he can push himself harder and faster than any normal man. Coupled with his lack of pain, he is practically superhuman. Choosing his name, he donned 
the identity of Acheron, the river that transported souls through the underworld in greek mythology. He would take the criminals from the criminal underworld and put 
them back into a world with rules, or die trying.