"What?"
Amid the chaos, Fang Xu turned toward Lü Yongchang and shouted, "Then why did that planetary fortress disappear?"
"It didn't disappear," Lü Yongchang corrected him again. "It's still in the same place. We just can't see it."
"As you know, the entrance and exit of a Klein bottle are connected."
"If-and I mean if-we altered the fundamental structure of a Klein bottle, integrating its entrance and exit into a three-dimensional spherical surface, what would happen?"
Fang Xu's expression shifted slightly, as though he had realized something.
"Exactly."
Before Fang Xu could speak, Lü Yongchang answered his own question.
"All light could pass through this spherical space without any obstruction."
"Invisibility is merely a side effect."
"No three-dimensional attack can penetrate this Four-Dimensional Shield and strike the White Dwarf Fortress!"
"It's like... how two-dimensional lifeforms living on a sheet of paper would have almost no way to threaten us."
"Then... what about [Hua]?"
Fang Xu voiced his objection in a daze.
As a two-dimensional lifeform, how could [Hua] damage a Three Dimensions Object?
"[Hua]... haven't you noticed that every attack it launches is intended to turn a Three Dimensions Object two-dimensional?"
"Only after turning a Three Dimensions Object two-dimensional can it truly attack that object."
"It's just that, in most cases, a Three Dimensions Object that has been rendered two-dimensional has already lost its original structure, so [Hua] doesn't need to do anything else."
"In short..." Lü Yongchang took a deep breath. "The gap between Lower Dimension and higher dimensions is enormous."
"Until we master dimensional attacks, conventional attacks will be completely ineffective against this White Dwarf Fortress."
Fang Xu turned to look at the White Dwarf Fortress, which had reappeared in the dark starry sky, glowing blue-white. His voice grew strained.
"Then... what should we do?"
Lü Yongchang