Start with F-Level Superpowers and High Energy

Someone sneered: "How dare an F-class come up and join in the fun?" Li You casually took off his shirt and said calmly: "F grade? You'll know after you try it." Before he finished speaking, the skin and flesh on his back suddenly tightened. A black dragon coiled around his waist and a black tiger stood on his shoulders. Black evil energy spurted out from his bones and blood. Scales, claws and tiger stripes swam ferociously under his skin. With a brutal and fierce beauty of violence, his momentum instantly exploded. The next moment, he moved and directly pressed the B-level ability user to the ground. The whole place fell silent for a moment.