The Emperor's Electric Reservoir was considerably far from the Yan Huang Ancient Region, so few people had been there. It was also a sea region but the sea region was made up of water that was fused with endless bolts of lightning. 

In that vast sea region, surging lightning was common, and it was even more frightening than the lightning created between layers of clouds. That was a sea of endless lightning bolts. 

Demons in that area were born in a very extreme environment. Since birth, they carried lightning bolts and were living creatures born for lightning. 

Their dao techniques and mystiques were all created amidst the lightning. 

On the Yan Huang Ancient Region, the Raging Thunder Marsh was a similar place. The Raging Thunder Marsh was also a region where lightning gathered. However, in terms of density of lightning bolts, it was definitely not comparable to the Emperor's Electric Reservoir. Moreover, the comprehensive strength of the Raging Thunder Marsh couldn't match the Emperor's Electric Reservoir. 

It was rumored that the Emperor's Electric Reservoir was formed from a discarded lightning bead of the Jade Emperor. 

Therefore, all the demons from the Emperor's...