Nightseeker is a class from the anime adaptation and video game series Sekaiju no Meikyuu, also known as Etrian Odyssey. As a character archetype rather than an individual, Nightseeker specializes in inflicting status ailments and striking from the shadows. They are agile, elusive, and often serve as assassins or scouts within the party. Their skills excel in debilitating enemies and supporting their team with tactical advantages. In the series, Nightseeker represents the mysterious and deadly aspects of dungeon exploration.