Layer upon layer of dense thunder clouds accumulated, enveloping mountain ranges stretching thousands of meters. The heavy thunder clouds weighed down so oppressively that it was hard to breathe. Beneath them, a purplish-red valley appeared remarkably isolated.
Martial artists did indeed exist here, though very few. A scattered handful stood gazing at the valley ahead, wanting to enter yet not daring to do so.
"Sigh, forget it. The natural thunder contained in the Thunder Penalty Heavenly Pool is simply too terrifying. It is said that these heavenly thunders have condensed into actual thunder penalties; let alone us, even Tribulation Gods might not be able to withstand them."
Chapter 440