Eric is born a null — level zero, unable to use experience tablets or stat boosts that everyone else takes for granted. After his parents die in a mining accident, debt-slavery drives him into the dangerous Dungeons of the Crooked Mountains. There, stripped of everything, Eric discovers that the very glitch that makes him worthless to the System makes him unpredictable, uncategorizable, and ultimately unstoppable.

Eric is pragmatic, cautious by nature, yet fiercely protective of the few he lets close. He distrusts most people by hard experience but extends instinctive loyalty once earned. His true power is adaptability — using artifacts, tamed monsters, and chaos magic through loopholes the System never anticipated, staying permanently at level zero while outpacing enemies who outclass him on every metric.

Across eight books, Eric grows from a desperate underdog scraping for survival in underground dungeons to the Magister of the ancient Order of Monster Hunters, fighting to hold back an alliance of dark forces threatening the entire world. Each book expands his world — from cramped dungeons to orcish steppes, otherworldly realms, and gnomish kingdoms — and his team of loyal companions grows to match.