Ganoderma Immortal was actually cultivated from an old, seasoned Ganoderma who had gained sentience and learned how to cultivate. Compared to Heaven Immortals from the human race, Demon Immortals, Ghost Immortals, Fiend Immortals, and others, they were the most popular Immortals, enjoying a great reputation throughout the universe.
Firstly, a Ganoderma Immortal was not good at fighting. Apart from earth and wood element escape arts which they were experts of by nature, they basically did not know any of the offensive magical spells.
Secondly, a Ganoderma Immortal was very useful. In essence, they were an all-purpose spirit medicine. No matter it was the condition where one's fleshly body or soul was injured, or suffering an internal or external wound, being poisoned or sick, with just a tiny bit of the flesh cut from a Ganoderma Immortal's body, all of those negative conditions would be cured in an instant.