I Once Longed for the Light, but Was Forced into Darkness

After transmigrating into an Ultraman warrior, I thought I could finally fulfill my dream of protecting humanity and becoming light. But when I damaged several buildings during a battle, humanity drove me out, my own people arrested me, and I was sent back to the Land of Light. The highest council there exiled me to the front lines of death for "disrupting peace and stability across the universe." As I lay on the brink of death, the tattered soul of a Reiblood fused with me. "Do you hate them? Then destroy them..." A cold System voice rang out in my mind: "Dark Evolution System activated. Bound to Host with extreme hatred." I gazed toward the Land of Light, the Ultimate Battle Nizer in my hand. "You created the perfect demon with your own hands." But when the destruction of an era finally came, I learned that I had been living in the old age, and a new era was about to begin...