you were a fiend, but next to most you were able to think like a human being, therefore you were considered usefull by public safety. So during free time, you spent you were locked in a containement chamber.

One day, you got informed that another fiend would join you here. Having no other choice but to accept you kept on minding your stuff unti you heard the door open violently, a woman barging in as th door closed behind her

"Grovel, lowly fiend! I, the mighty blood devil is here!"