I! Changed to Lich King and Resurrected the Old Principal at the Beginning

Three hundred years ago, the game came to reality, and the rules of the world changed drastically. Monsters are rampant in the wild, there are countless copies in secret realms, and the atmosphere is full of killing. Fortunately, humans can become stronger by changing jobs and upgrade themselves by constantly destroying monsters! Xiao Ran, who came from time travel, awakened the only hidden profession at the beginning: Lich King! Ang Lee, the veteran of 80 years ago, became a nightmare for countless monsters just by changing his profession to a plague death knight. As the strongest death knight, the Lich King must be so powerful. After changing jobs, Xiao Ran's soul mutated, obtained an undead altar, and summoned various undead heroes to fight for him! Death Knight, Lich, Dreadlord, Crypt Lord... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.