Source: Symbiosis 2: Night Journey

The emergence of giant spiders and zombies brought huge disasters, and mankind suffered an unprecedented attrition. The Military Saint Corps with special abilities became the main fighting force, and in the end these people who lived at the top were the only ones left in the world. After gathering the strength of many powerful teams, they launched a general attack on the zombies, but it ended with basically no consumption. Demons appeared, and countless demons dealt crushing damage.