Glacius' eye twitches at Nux's suddenly raised voice. What sort of answer is this human expecting? It would be like asking someone why they were made of flesh and blood. Because that is what the laws of their planet dictated, that was the rule of their physiology. Even Glacius wasn't exempt from nature's fundamentals; within his icy armor laid a traditionally organic underbody, but he wasn't about to reveal that fact given his secretive nature. "Because my homeworld is a white planet," he answers, "Completely blanketed in ice and snow. My species evolved accordingly; we thrive in the cold, just as your species prefers the warmth."