Gu is a very magical thing.
Dong Huiying refined many Gu; some were poisonous, some could heal diseases, and others were bizarre, endowed with various functions.
This Gu, resembling an earthworm, she named "Water Life Gu." First, because this Gu was water-based and would swell in water continuously, secondly because the Gu could secrete a miraculous liquid that could save lives. Even if one were to suffer from severe injuries, as long as this liquid was present, they would not die. However, the Gu was not omnipotent. It had a time limit; it could only prolong life for two days at most. During this process, the human body must have enough water for the Gu to grow in order to secrete the life-saving liquid.
But once two days passed and the Water Life Gu had grown sufficiently robust, it could rupture the human body. The host's ultimate fate was to die from explosive dissection as the once-saving liquid swiftly transformed into a deadly toxin after losing effectiveness.
