Beyond the Diabolical Dragon Palace were dozens of gigantic palaces.

Each palace was as wide as a lesser realm. Among which, those palaces belonging to the three 7-heavens demon king were the largest and closest to the Diabolical Dragon Palace.

The palaces within the Underworld Dragon's Den were arranged like stars surrounding the moon with the moon being the Diabolical Dragon Palace.

Next to the Diabolical Dragon Palace, one could see three gigantic palaces for the three 7-heavens demon kings followed by nine palaces for the 6-heavens demon kings. Furthest out were over thirty palaces for 5-heavens demon kings. Together with the rest of the palaces, they formed the vast and majestic Underworld Dragon's Den. 

One could say that the entire Underworld Dragon's Den was over a hundred times larger than the Jambu Realm where Wu Yu was born.

"There are great void immortal designs around the palaces for 6-heavens demon kings and 7-heavens demon kings. They aren't concentrated and we could still observe from a distance. However, entering wouldn't be possible."

"For the palaces of 5-heavens demon kings, we are able to enter without drawing the attention of the demon kings within the Underworld Dragon's D...