"A Herd of Sacred Beast Spirits" 

Of course, what ability users and beasts needed to be was  not the spiritual energy. 

However, it didn't mean spiritual energy would always be harmful. 

Many stones, ores, and various natural resources that had been placed in a place full of spiritual energy and spirits would mutate to become special materials that not many people could get. 

Not even rich ability users and influential people could easily get these resources related to spirits. 

The Billios Family was a big business family, but they also rarely got materials related to spirits, and that's why the shaman guild monopolized this kind of resource. 

"The spirit curtain is made of spirit silk, which is like the clothes of ghosts. It's light and feels as if it doesn't exist, but it did exist." 

The spirit silk was made of water and special threads from spider beast spirits and plant spirits who lived in a place full of spiritual energy.