The Nine Extreme Underworld Sect was an ancient sect that Qin Heng encountered during his cosmic adventures, known for wielding the power of Nether.
The sect's strength was extremely formidable, and although it was located in the borders of the universe, its power was no less than the top sects in the central star river region, or perhaps even greater.
Due to the extreme similarity between the Nine Extreme Underworld Sect's power and Nether Qi, many sects once mistook it as the result of Nine Nether's erosion of the mortal world and attacked it.
Despite this, the Nine Extreme Underworld Sect continued to thrive, growing stronger despite attacks from many sects, even slaying True Immortals descending from the Immortal realm!
Through a series of battles, mortal world sects realized that the Nine Extreme Underworld Sect wasn't eroded by Nine Nether; although Nether power resembles Nether Qi and is related, the two are not exactly the same.
