Amnesia? I Am the Great Old One

Introduction: Awakening in the deep sea, memories become a mystery. He was once an ancient evil god who swept through the era, but now he is just an "ordinary person" who has lost all his power. In order to protect the light of the person next to him, he chose to fight against his former compatriots and became the last barrier of human civilization. When the old whispers of the deep sea echo again, will he choose to regain his cold godhead, or use his human heart to kill gods? This is a human decision that belongs to the old rulers.