The underworld had always been as mysterious as the Sky City of the God Race. The entrance to the underworld was not as elusive as the Sky City, but no one dared to step into it. The biggest passage to the devil’s realm was located in a valley of the Radiance Continent. After the war against the devils, the Light God sealed the passage of the underworld with his godhood. However, no one knew that this seal was actually a one-sided seal. It could only prevent the devils of the underworld from going to the Radiance Continent, but it could not prevent people from entering the underworld from the Radiance Continent.

For a long time, the God’s Domain had been sending people to strengthen the seal of the entrance to the underworld and prevent anyone from entering the devil’s den.

But just a year ago, the god’s envoys stationed at the entrance of the underworld were killed. Since then, no one from the God’s Domain had been stationed there. As a result, the seal of the underworld’s entrance was gradually weakening, and the restrictions on the devils had become weaker and weaker.

On the Radiance Continent, only the people of the God’s Domain knew the specific location of the entrance to the underworld. However, since Satan appeared again, the God's Domain, from top to bottom, had kept their lips entirely sealed, without the slightest intention of revealing any news to the outside world. All the survivors of the attack on the underworld’s entrance had also been transferred back to the God's Domain; they had given up their protection of the underworld’s passage.