Layer upon layer of dense thunder clouds accumulated, shrouding the mountain ranges spanning thousands of meters. The oppressive weight of the heavy thunder clouds made it hard to breathe, and a purplish-red valley beneath the clouds appeared exceptionally secluded.
Martial artists did indeed exist here, though very few. Scattered martial artists merely gazed at the valley ahead, wanting to enter yet not daring to.
"Alas, let's forget it. The natural thunder contained within the Thunder Penalty Heavenly Pool is simply too terrifying. It is said that these natural thunders have already precipitated into a thunder penalty; let alone us, even Tribulation Gods might not be able to withstand them."
Chapter 440