This was similar to channeling himself.
The reason why Levi had learned Nature's Secret Language was mainly to tame some extraordinary creatures to be used as a drug primer.
Levi's taming methods were definitely not as gentle as the shamans of the School of Spiritualism. He would directly beat them half-crippled before capturing them alive and bringing them home to slowly train them...
Levi believed that as long as one had a similar level of intelligence and was afraid of death, there would be no supernatural creature in this world that could not be tamed with one's fists. If there was, it would be because one's fists were not hard enough.
With the special effect of [Nature's Heart], Levi's speed of cultivating Nature's Secret Language was not slow.
Three months later, in the year 1032 of the Holy Brilliance Calendar, the Month of Vitality, Levi raised this spell to Level 4.
Levi-