玄铁，是在金庸小说当中记载的材料，颜色深黑，隐隐透出红光，极为沉重，熔点高，有磁力，开锋後削铁如泥，玄铁极为稀有，且材质特殊。

玄铁是变形金刚中的人物，在领袖之证中是震荡波为完成威震天所给他的任务提炼塞伯坦核酸时与天豹和众多巨狰狞一起制造的史前巨狰狞复制品。
虽然玄铁的出场次数甚少，但他的贡献却不容忽视。
Darksteel is one easily amused Predacon. Whether it's surprising Autobots, whacking Skylynx over the head with a bone, or thinking about the gutting of other Cybertronians, you can bet that Darksteel's going to laugh it up. At least he can stop joking long enough to scrap some Autobots.
Darksteel was created, along with Skylynx, by Shockwave and Starscream, who were re-creating an old plan; Project Predacon. Darksteel revels in combat, particularly combat that ends with him standing victorious over a damaged Autobot. Darksteel appeared in Predacons Rising. Darksteel laughs a lot, is very easily amused, and often has a sick smile on his face. These traits make him a jovial Predacon.