C53 Chapter 53

In East Forest, anyone who had ever been on the battlefield knew just how terrifying that mass of black mist was. Once it swallowed you, out of every ten people, two or three would die on the spot, two or three would go insane, and of the rest who survived, none would come out unscathed.

The black mist was not only incredibly lethal, it also ate away at a person's will and mind