Plagues could include contagious diseases caused by fungi, bacteria, or viruses.
The G virus is a very special entity. When Han Dong first came across the game Biohazard in his previous life, he envisioned researching this substance.
It has to be said, this fate event with a game as its background presents an enormous, complex scene mixed with various "phases".
Completion of the current phase's requirements is required before moving on to the next phase.
Before entering the next phase, many areas are sealed off, with forced destruction prohibited.
"S.T.A.R.S. Police Station" → "Underground Facility" (first encounter with Dr. William in G1 form) → "Police Station Rooftop" (Tyrant's arrival) → "Sewer System Series" (interaction with Ada Wong, encounter with Dr. William in G3 form) → "Laboratory Central Area" (encounter with Dr. William in G3 form) → Final double BOSS battle.
(The Tyrant is a humanoid weapon from the Biohazard series, created by the Umbrella Corporation.