Roar...
A low beastly roar echoed from the depths of the lava valley now and then.
This Fallen Demon Valley was the only valley Reilo had seen since entering the Underground World whose geological plates remained exceptionally stable.
A glimpse through a tube revealed the whole picture.
From this perilous valley in the Underground World, Reilo could faintly glimpse how complex and powerful the flourishing ecosystem there had once been.
"Once we cross the molten scorpion pool ahead, we'll be able to pass safely through Fallen Demon Valley and head to the next valley."
The Nine Nether Rat Demon leading the way explained.
The liquid magma in the lava valley flowed quietly like a placid stream between the black sedimentary rocks. It was both the source of energy and heat here and the foundation of the lava creatures' survival and evolution.
"Molten scorpions?"
Hearing this, the Canary Painted Skin said, "Although molten scorpions aren't among the higher demons, they're outstanding even among the mid-level ones. I've heard that when the Demon God Temples in some remote valleys have no other choice, they'll temporarily use these demons as guardians during a transitional period. That alone shows their combat potential shouldn't be underestimated. If they gather in large numbers, even we might have trouble dealing with them, right?"
Speaking of higher demons, those Bone Abyss Flying Scorpions that once invaded the surface world had certainly caused the people of the duchies plenty of suffering.
Many powerful warriors had died beneath their claws.
And Bone Abyss Flying Scorpions were just one of the millions of species of higher demons in the Underground World.
From this, it was clear that if human scholars hadn't used the superiority of civilization to achieve overwhelming three-dimensional dominance over the Underground World with Law Power weapons, and brought