Having just experienced the Dark Cave battle not long ago, upon seeing such a bizarre scene, they subconsciously thought of the Corrosion Core.
According to the Guidance description, the Corrosion Core is a Black Tide abomination naturally generated under the Evil Moon, slowly permeating and severely damaging the environment of the area it forms in.
The Domain Crystal of the Dark Cave battle's Node Domain had once been entangled and infiltrated by the Corrosion Core.
"Unclear, let's keep going and have a look."
5 minutes later, the two of them passed through a patch of withered Fluorescent Grass, and the view in front suddenly opened up.
Deep in the dense forest lay an enormous field divided into squares. All the Spirit Plants growing within had withered away, and the air was filled with a faint stench. In the center of the field hovered a meaty, pulsating Corrosion Core.