"No one knows why, but this is a question that the upper echelons of all forces and most powerful beings want to know the answer to." Flare didn't tease Catherine for her small blunder, but solemnly said, "Everyone only sees the result, which is that after the Undead had increased to a certain number, they stopped expanding their ranks. Apart from a portion who continued to serve as sentries, the remaining Undead focused on strengthening their positions, solidifying their defenses, and even building higher walls."
"Walls?" Pannis raised an eyebrow and pursued, "Even if they have developed self-awareness, understand how to wage war, and know how to construct defensive fortifications, what are they building walls for?"
