"Every fifty meters we descend, the mana concentration doubles," Slate continued as their path spiraled deeper into the earth. "At one hundred meters, where our regular patrols end, the density is four times what it is on the surface. And the monsters…"
As if summoned by his words, a distant, guttural roar echoed from the abyss below.
A ripple of unease passed through the students.
"Beasts are drawn to crystal deposits," Slate said, a faint
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