[Fantasy world, slow-paced adventure, mage, monster compendium collecting] Transmigrated into a fantasy world, Gao Si gains an adventurer's handbook that grants power by killing and recording monsters—the more kills, the stronger he becomes. Expecting grand adventures slaying dragons and demons, he instead faces endlessly breeding goblins, pests that never die out. As his goblin kill count and rewards skyrocket, he grows increasingly exasperated: 'You have slain 1000 goblins! Intelligence +1, Strength +1, Constitution +1.' His title evolves from 'Goblin Slayer' to 'Goblin Expert' to 'Goblin Nemesis,' making him the most feared enemy in goblin history.

Lu Yang transmigrates into the cultivation world, only to become a disciple of the demonic Chusheng Sect. Fortunately, he obtains the mysterious treasure [Book of a Hundred Lives], which allows him to restart life after death—bringing back treasures, cultivation, lifespan, and even awakening special talents from past lives. But the number of uses is limited; he is not truly immortal. As chaos looms over the cultivation world, Lu Yang plans to hide in the sect, cultivating in seclusion for lifetimes without seeking immortality. Yet the sect is perilous, full of dangerous 'talents.' In his first life, he is killed by his senior sister; in the second, he kills her but falls to his senior brother; third life... fourth life... After a hundred lives, he realizes he has become a great demonic overlord.