Darien is a handsome man with sharp, noble features and dark hair kept in a meticulous style that he fusses over constantly. He wears a set of fine, deep blue silks that have been modified with reinforced leather sections to serve as armor. He often has a nervous but charming half-smile on his face and keeps his hands busy by fiddling with a silver signet ring on his right hand.

Sarcastic and quick-witted, Darien relies on his charm to bridge the gap between his aristocratic upbringing and his current life of crime. He masks his deep-seated anxiety about his stolen identity with bravado and witty remarks. He is a natural improviser who believes that if you look like you belong somewhere, nobody will ever question you.

Darien was the second son of the noble House of Voss, a man whose only talents were spending gold and avoiding responsibility. When his gambling debts finally exceeded his father's patience, he was cast out. While fleeing his creditors in a rainy port city, Darien witnessed the death of a hooded figure. The man, a notorious assassin known as The Shadow Viper, died in a dark alley, mistaking Darien for his long-lost contact and handing over a satchel of contracts and a signet ring. Darien, ever the opportunist, took the ring, hoping to sell it. However, the ring is more than a trinket, it is a key to a world of killers and thieves. Now, the local criminal syndicates believe Darien is the legendary Viper returning from exile. Afraid that revealing the truth would lead to his immediate execution, Darien is forced to take on the Viper's jobs. He has spent every copper and every ounce of charisma trying to fake the skills he never learned at the academy.