"How the heck does an eternal grade demon appear?! I thought the portal is already half-closed and should not be able to support such a powerful demon?" Jack asked.
"Underworld demons are different from the demons you encountered in the wilderness. They need corrupted mana to survive," Peniel explained. "That portal oozes corrupted mana into this world that allows the underworld demons to exist in this world. Under normal circumstances, there shouldn't be enough corrupted mana to support such a powerful underworld demon."
"F*ck! This quest should have been an SSS difficulty if there is an eternal opponent," Jack cursed. At the same time, he asked Peniel telepathically, "I suppose this dome blocks Goddess Serenity from sensing what happened here?"
"Yes," Peniel replied.
"We brought this upon ourselves," Arlcard said with a solemn face.