After hearing Undead Skyfall's proposition, Jacob's expression didn't change, but inwardly, his thoughts moved rapidly.
'Fifth layer of Space? Primordial Deep? Even Gods have to tread carefully here?'
Jacob was alarmed; he had heard of the Shadow Expanse and knew it bordered the Abyssal Void. But he had never heard the term Primordial Deep.
However, judging by Undead Skyfall's tone, this wasn't merely another region of space, but it was a place where even Gods needed to be cautious. That made Jacob's situation considerably worse.
Although Jacob had yet to encounter this knowledge, much less wander the Primordial Deep, he wasn't arrogant enough to believe he could survive a place even Gods were cautious about.
But Jacob was still skeptical: no matter which layers of space they were in, they were still in the Middle Plains, so no matter how deep the layer of space was, the rules of the Middle Plains should still apply.
