The power.
At the age of 4, Brayn was torn from his home, dragged into the darkness of a mysterious school. There, he undergoes merciless conditioning which transforms him into a formidable mercenary, devoid of feelings and pity. The school's masters forge his mind into steel, removing all empathy, leaving him with an emotional void that makes him insensitive to human suffering.
Having become an accomplished mercenary, Brayn is released into the world without ties, deploying his deadly skills according to contracts.