"In a world where zombies coexistence with humans in an uneasy peace, the quest for a cure seemed futile. Yet, after relentless experimentation, we began to witness breakthroughs: enhanced intelligence, adaptive skin pigmentation and more. Unbeknownst to us, our improvement would ultimately prove catastrophic, giving rise to five new, formidable zombie strains. Initially, these advancements instilled hope for humanity's salvation, but we gravely underestimated the creatures cognitive abilities. By the time we realized our fatal mistake, it was too late.