The Sons of Salem

His nerve system's don't seem to transfer pain like ours, deadening the sensation, but also producing vast quantities of adrenaline- enough to kill a man who didn't have the body and cellular endurance Mark does. As fights go on, his skin grows flush and his pupils dilate as the fight goes on.

His adrenal glands are also swollen and deformed, capable of much higher outputs than normal, and producing yet unidentified growth hormones that help prevent his neurological systems from shutting down, even from pain or blood loss.

At one time, Amaryllis's arms were normal, unscarred, and white as a dove. She would wrestle with her brothers, surrounded by soft and fluffy couches, plug protected outlets, and edge protected tables. They were safe, mostly, until one gave another a shallow scratch with their fingernail. From even a single scrape, the children would ruin rugs and throw pillows as the Fleischer Family Curse took its toll, forcing them to make a sizable plasma donation to the house. They all knew the risks, of course, they had the band-aids and medical bandages on hand to stop the bleeding. They continued their roughhousing beyond earshot of their parents...

Amaryllis's mother, Dahlia, knew the truth of their family's curse. She understood that time was running short as Sorin had already passed away years before. She and her husband studied the occult, making a fortune by reading futures, holding seances, and investigating hauntings. The greatest ritual they ever developed was one to break their curse. She knew Amaryllis, the first-born, would need to be saved first, as soon as possible, before she followed Death to meet her husband.

Something was not right, Amaryllis had passed out early in the bloodletting phase of the ritual. She struggled against her bindings and exasperated the new cuts on her wrists. The long gashes and otherworldly lettering on her arms wept until they went blue. Dahlia completed the runes and smeared a circle in blood around her daughter before realizing that the ritual was faulty. She then realized that her baby girl was on Death's door. She rushed Amaryllis to the hospital in heavy bandages, but her body would refuse to close her wounds. Dahlia would die a year later, consumed by the knowledge that the ritual failed.

She was wrong.

His Bodily fanctions translate to just HP(hit points) to him as in a game hence he doesnt feel pain as normal people.
His Mind becomes twisted and all knowledge and experience he has playing games materialize in his real body making him calm and collected.

Osmand's scar covered body continues working, years in the mines is nothing compared to this.

No pain

The mobster's been through tougher scrapes than this. A few cuts and bruises won't stop them.