Apocalypse System: How To Destroy My Resources?

Chapter 576:

In short, as long as this barrier exists, no wild zombies can infiltrate the area under its protection. Even if they manage to enter, they cannot hide or cause harm. Humans living within the zone will enjoy maximum security.

The stronger the faction, the denser the human population within, and the more resources and higher level of development it commands, the broader the barrier's coverage. The instant elimination threshold for zombies will also rise accordingly.

However, the system is not without its weaknesses.

Firstly, when the barrier purges zombies within its range, its area shrinks. If the barrier's size falls below 30% of its previous day's coverage, the Safe Crystal loses its ability to level up or regenerate. Once its coverage drops to 10%, the Safe Crystal enters a self-destruction process, eventually disappearing permanently.

The idea of throwing the crystal into a zombie horde was abandoned immediately. While it would indeed kill many zombies, the crystal itself would be