He used to be a tortured and submissive slave, but now he tortures and brandishes new victims.
When he was a child, he was kidnapped in the middle of a forest and made an effort to battle his way out of the brutality of his traders and his captors. In response to his frantic outcry, a hot, flaming rod was used to burn his face. After this, he gave up the struggle for freedom and swore allegiance to their masters. He was elevated to the closest rank of the slave merchant who controlled the market and the economy after witnessing the barbarous deed on him. Most of his work at that point was controlling new slaves and thrusting a circular heated metal rod at them.
Even though he was a servant, he was taken seriously and given a golden mask to cover his burned face as a sign of appreciation for his service and loyalty.