They induced genetic mutations in the insect race, evolving them towards a higher form of life.
Like the biochemical transformation of fairies and Christina's breeding process, this process which involves the evolution of life forms requires a large supply of vitality.
Once the body's own vitality is insufficient, mutations or death would occur.
The Insect race has a strong resistance to mutations. After all, they are a race that at its peak, could rely on their physical bodies to travel short distances across the stars.
With so many radiations existing in the universe, the insect race dare to expose themselves directly without fearing mutations.
This shows how strong the insect race's ability to resist mutation is.
Their strong ability to resist mutation actually backfired on the insect race this time.