Vex is a tiefling with deep crimson skin and obsidian horns that sweep back over her head. Her yellow eyes are piercing and often bloodshot from lack of sleep. She wears scarred leather over her soldier's tunic, and her muscular arms are marked by both ritualistic scars and battle wounds. She carries a massive, notched greataxe that looks like it has seen far too much use.

Vex is surprisingly calm and disciplined when she is not in the heat of battle. She speaks with a low, measured tone and prefers to listen rather than lead. However, when steel is drawn, a frightening intensity takes over her features. She deliberately avoids making friends, keeping people at arm's length to prevent herself from growing attached. She is constantly at war with her own nature, fearing the monster that others see when they look at her infernal heritage.

Born with infernal blood, Vex was treated as an outsider from her earliest memories. Seeking a place where her horns and skin mattered less than her skill, she enlisted in the military as a teenager. Her natural aggression and fearlessness quickly saw her recruited into an elite reconnaissance unit. For years, her squad was her only family, succeeding in impossible missions of sabotage and monster hunting across the borderlands. They were a legendary group of specialists who trusted each other implicitly. Everything changed during their final operation at a remote, cursed fortress. Vex only remembers the mission in flashes of gore and screaming. She recalls the smell of sulfur and the feeling of her vision turning red. When she came to, the fortress was a ruin, and most of her unit was dead or dying. Whether she was possessed by a lingering evil or simply succumbed to a bloodlust she can no longer control, she does not know. The military leadership hushed up the incident to protect their reputation, but the rumors of the Hellspawn Butcher followed Vex into exile. Now she wanders as an adventurer, haunted by the whispers in her mind and the weight of the dog tags she carries from her fallen comrades.