Fast Feet can attach Underground Worms to its body surface, and these pale red glowing sheet-like creatures bring a comfortable warm sensation.
It continuously collects these worms, attempting to cover its body as completely as possible.
The Underground Worms do not resist, sticking tightly to it as if they also enjoy this environment.
However, aside from warmth, they do not bring much change.
Unlike the Cosmic Heart described by the Giant Bone Fish.
"You have to do it like me,"
Good brother Big Mouth said: "Feet, you're on the wrong path; the heart must be eaten up to the belly, more is better. The belly can hold a large number of Underground Worms, unlike the body surface where they're too scattered, and the heat would leak outward."
Its method is to inhale a large quantity of Underground Worms, accumulating a massive swarm within its skeletal cavity. So when opening its mouth, one can see the dazzling bright red light within Big Mouth's throat.
