Dark Terrorclaw is Terrorclaw's dark side. When he absorbs dark energy, he is consumed by it's power. But when he can't control it, he loses his ability to keep calm and stay in control of his body and mind, so his evil breaks loose. He becomes a complete monster, and his body size increases, and his fur darkens. This beastly form will kill whoever gets in it's way. His eyes may glow red or dark purple when the darkness surges through him.