Global Class Change: I Am the Master of an SSS-Rank Death Knight

Blue Star Year 4588 Everyone awakened a profession, each person doing so at the age of eighteen. At the same time, countless secret realms, dungeons, and forbidden lands rose up all over the world. Then came countless high- and low-level zombies. Although humanity had awakened professions, their levels were low, and conventional weapons were useless. They had no way to fight back. Before long, zombies ran rampant across Blue Star, unstoppable by anyone. Humanity had no choice but to build small underground fortresses one by one and cling to life. … This synopsis can't do the story justice. Please head to the main text.