Fourth Grade Everlife Wood required a sufficient amount of Everlife Soil to advance, and it was also the Destiny Spirit Plant for practitioners of the Qing Emperor's Longevity Scripture, extremely important.
And the source of this Everlife Soil was the fertile fields spanning thousands of miles where the Heavenly Sovereign's true body resided, rich and lush with vitality.
However, all of this Everlife Soil was needed to nourish the Heavenly Sovereign's true body. Taking a little bit might be acceptable, but if too much were removed, the Heavenly Sovereign would definitely not be pleased.
Therefore, the technique of "Origin Field Nourishing Fertility" was created.
It meant that all kinds of different soils from across the world, after being cultivated with this Grand Spell, would possess the properties of Everlife Soil, nurturing the advancement of Spirit Wood.