Mysterious Cave
The Greia's mana density was ten times lower than the Eidin. Eidin was the world where Souta, Alice, and Yuko arrived. The density of mana was too low compared to that world. The same could be said of the Prison World. He could understand why the Great Astley Empire wanted that world for themselves. Yet, the mana density of the Imperium was thirty times higher than that of Eidin.
Three hours had passed since they'd arrived in this world. Souta discovered monsters that he hadn't seen in the Imperium. He was a little bit surprised about it, but considering the parasitic essence eater, he quickly calmed down.