After Guarding the Tomb for Thirty Years, I Became the Emperor of Eternal Night!

Ye Chen traveled to a foreign land full of unknowns, which was turbulent and full of wars. Unfortunately, he traveled through time and became an undead, and he was also the weakest skeleton soldier. I thought this life was hopeless, but unexpectedly, I suddenly awakened to the tombkeeper system. "You can get a reward by guarding the tomb for 8 hours a day?" So, in that turbulent city, an undead man who insisted on guarding the tomb and checking in began his journey to become stronger. Guard the tomb for 43 days, evolve into a lich, and obtain the dracolich scepter! Guard the tomb for 894 days, evolve into the Skeleton King, and obtain the Skeleton King suit! After guarding the tomb for 1534 days, he evolved into the Skeleton Emperor and obtained the artifact: the Soul-eating Hammer! … Ye Chen just guarded the tomb in the City of the Undead, flirted with the banshee lady when he had nothing to do, and occasionally went to kill a dragon outside the city, living every day peacefully. But one day after traveling thirty years, Seraphim led the Holy Legion to the city and faced a tide of enemies. He smashed the angel's head with a hammer, and then awakened millions of dead corpses on the battlefield... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.