Survival in the Haunted Building: My Haunted Creatures Upgrade Infinitely

[The rating has just been released and will increase later.] [Semi-infinite flow, eerie building survival, mild horror, containing eerie creatures, character development and leveling up, multiple female leads] People often say that everyone should strive to reach higher goals, right? "You want to know what happened to those who went downhill?" "They're all dead." —————— Billions of people were thrown into an endless, gigantic, bizarre building, each with their own private room. Forced trials will be held periodically. Successfully completing one trial will advance one level, while failure will result in falling one level, until one falls to the bottom. Lu Li was selected by drawing the unique talent [Monster Containment]. After clearing each trial, he can choose one monster to bring back and nurture it for upgrade. Everyone not only has to face various trials, but also deal with the strange events that may occur at any time in the haunted building. —————— Within the haunted building, only by constantly climbing upwards can one find the only way out.