The underground dark zones beneath the Jiuzhou Continent had never known silence.
Seven miles beneath the mortal topsoil, trapped in massive underground cave systems that spanned millions of square leagues, stayed the ancient astral leftovers of the Primeval Fiends.
Every three months, during the lunar eclipse, these entities emitted an everywhere at once, low, deep-rumbling scream—a terrifying, low-hum pulse shaking at exactly point-five hertz.
The sound couldn’t be heard with human ears, but it rang through human bone marrow.
When the infrasound passed through mortal cities, farm animals threw themselves into wells, sane mothers cried in uncontrollable hysteria, and three hundred thousand Core Formation fighters suffered violent heart-demon deviations that turned their hair snow-white overnight.
“The Screaming Fiend of the Deep pit is the karmic rot of the planet!” declared Array Patriarch Xuan Zhen. His satin sleeves shook as he addressed the jury table on Tongtian Apex.
He held up a shattered jade sound disc inscribed with ancient protective runes.
“In ten thousand years,” Xuan Zhen lamented, “the Formation Guild has erected sixty thousand sound-dampening stone steles! We have laid down magic charms of silence three arm-lengths thick! Yet point-five hertz infrasound penetrates granite like wind through a willow hedge! No barrier of jade or starlight can stop a wave whose wavelength is four miles long! It’s the eternal, unavoidable torment of the lower realm!”
