Itsuke comes to house in Heaven Dou City from sunset forest and goes to small world.
After coming back to small world then itsuke planted all the immortal herbs in land where herbs properties are not damaged and grow quickly in this small world.
Because of multiplying the immortal herbs with his soul abilities, there are thousands of immortal herbs and these thousands of immortal herbs are placed in the attributal locations according to their attributal properties of immortal herbs.
The concentration of energy of the places where immortal herbs are colletively increasing due to properties of immortal herbs which were innate energy gathering ability of immortal herbs.
Immortal Spirit Grass, is a naturally psychic and rare Immortal Herb or a plant-type spirit beast the moment they grow, as they already possess wisdom or intelligence.
It is quite picky with its environment, has very strict growth conditions, and treats spirit beasts and humans as enemies; however, befriends and likes to live along with Demoneye Trees, for it uses its pungent smell for its own cultivation. A thousand-year-old Sacred Soul Grass is already considered a treasure.