After devouring the "Gold-Eating" left behind by the Gold-Eating Beetle Mother, the Gold-Devouring Insect King's aura had clearly grown much stronger.
However, it was still only at the perfected Earth Immortal Realm, with no sign of breaking through to the Heavenly Immortal Realm.
Devouring one another was itself a special evolutionary method among spirit insects.
It was also a way of nurturing Gu insects.
After rounds of mutual slaughter and devouring, only the strongest remained.
Even if Lin Fei had not subdued the Gold-Devouring Insect King, one day in the future, in order to increase their strength and break through to the Heavenly Immortal Realm, a life-or-death battle would still have occurred between the Gold-Devouring Insect King and the insect mother.
The weaker side would become the stepping stone for the other's breakthrough into the Heavenly Immortal Realm.
As long as a Heavenly Immortal Realm existence was born within the swarm, the swarm's upper limit would rise significantly, and it would have more living space and resources.
Take the Blue Flash Butterflies, for example—eighth-rank spirit insects.
Logically, they were not qualified to survive in the core region of Medicine Mountain, where ninth-rank spirit insects ran rampant.
However, as long as a Heavenly Immortal Realm Dreamlike Flash Butterfly was born among the Blue Flash Butterflies—
That Dreamlike Flash Butterfly could protect them, drive away and hunt other spirit insects for them, and obtain more resources for the Blue Flash Butterfly swarm.
As a result, the Blue Flash Butterfly swarm could breed more offspring, and the likelihood of stronger individuals being born would increase.
After the Gold-Devouring Insect King absorbed the energy of the "Gold-Eating," it raised its head and let out a shriek toward the sky.
The many surviving Gold-Devouring Insects trembled in fear and flew toward the Gold-Devouring Insect King.