While the Wise Sovereign was astonished by the Ultimate Luxury Nightmare Domain, the Black Earl found it nothing out of the ordinary. Though he did not know the principles behind Nightmare Domains, he had once seen Sanders unleash the Black Tower Nightmare Domain.
The Ultimate Luxury Nightmare Domain Angel had unleashed gave him the exact same feeling as the Black Tower Nightmare Domain, as though they had come from the same lineage.
Countless people had studied Sanders's Black Tower Nightmare Domain, including the Black Earl, yet none had uncovered any results. In the end, they could only regard it as a unique illusion art of Demon Illusion Island.
The only ones still researching the Black Tower Nightmare Domain were probably those wilderness wizards from the Rat-and-Ant Underground Society. They considered themselves Sanders's sworn enemies, so naturally they wanted to thoroughly study every one of his abilities. In truth, Sanders had never even given them a proper glance.
As for researching Nightmare Domains? Back then, the Black Earl had secretly coaxed Su Mishi to the Noah Clan Lands, intending to secretly study his Demon Abyss Nightmare Domain. In the end, he had nearly been dragged by the shadows within the Demon Abyss into some unknown abyssal cavern.
Later, the Black Earl had asked his old friend Rhein about Nightmare Domains. Rhein had not answered directly, but he had provided one very clear piece of information: only people from Demon Illusion Island knew how to use such things. Moreover, Sanders was currently the only one capable of wielding a Nightmare Domain perfectly. Everyone else's Nightmare Domains had basically been carved out by Sanders.
At the time, Angel had not yet been born, so Rhein's words had not been wrong. But now, naturally, the answer was different.
That aside, after questioning Rhein, the