In 3000, World War III broke out due to resource shortages, and nuclear leaks caused incredible destruction in many places. The scope of human activities gradually narrowed, and a truce was negotiated in 3012, entering a brief period of peace.
Invisible and unconscious substances appeared for the first time in untouched lands for unknown reasons, turning everything they passed into scorched earth, and showed great interest in attacking human settlements. Because it has no form, it only appears in a dark, mostly black and purple state with no edges. Religious groups have interfered with its research, and it is generally believed by the people to be the souls of those who died in nuclear wars. Name it - quality binding.
In 3030, hostages appeared frequently near human settlements. As humans began to deal with the hostages, untreatable diseases began to spread...
Purpose: Protect our homeland