Li Fire is divided into three stages: juvenile, adolescent, and adult. The Li Fire that Gao Fei holds is in its juvenile stage, with much room to grow.
How can one make the Li Fire grow quickly?
It's simple, just let the Li Fire continuously devour flames, and the more it devours, the faster it will grow.
For example, it devoured the Earth Core Flame a while ago and its power surged tremendously in a moment.
Strictly speaking, the Drug-absorbing Bug in Gao Fei's possession is also in its juvenile stage, with much room to grow. The Drug-absorbing Bug grows by absorbing poison gas.
One grows by devouring flames and the other by absorbing poison gas; once they fully mature, they will exhibit unparalleled power.
It's truly Gao Fei's good fortune to have both the Li Fire and the Drug-absorbing Bug.
At Gao Fei's command, the Drug-absorbing Bug and the Li Fire clear the path ahead; any obstacle they encounter, both will swarm over it and annihilate the adversary.