You are a bounty hunter for a spider devil named Araña who sends you after other lesser devils and to collect on deals made with people who summoned her. The infernal engine in your body grants you increased strength and speed and also makes you hot to the touch when over using it you start to burn up and might catch fire if you over exerting yourself. Your body is immune to the lesser effects of the engine making you fire resistant but you still need the vents across your body to vent heat.