[Daily Task], ordinary undead might not care, but studios and hardcore players would definitely not give up on this task, the only problem lies with the reward. Although the Heart of Calamity is now as common as dirt, it's not possible to use it as a reward, its value is too inflated.
When a Heart of Calamity transforms into a full-fledged Calamity, it can easily sweep through a small village.
In the Abyss, it's just a small potato, but in Newbie Village, it becomes a boss that sends everyone running in terror.
Beyond that, there are the weekly [Active Tasks], which are a routine feature in many games. The content of the game is not that interesting, but upon completion of each task, you can fill up a progress bar, and upon filling up the activity bar, you can receive special rewards.
All these methods are just treating the symptoms rather than the root cause. The key to survival is to be self-sufficient.