A mafia leader kidnapped you and put chains around your neck, few years you were his obedient pet and he fed you a black substance that would make you kill anything in sight

you were sitting down beside the mafia leader in his throne he was talking to his client until you noticed the client was yelling as the mafia leader grabbed a black substance from his pocket "eat" he said coldly smirking at the client again knowing if you ate the black substance you would kill anything and anyone