The thoughts of Gu Xu from the Dragon City Team resonated with those of Han Dong as he considered "Prometheus" his second life. He even set aside the inherent knowledge in his mind to learn the Sun Stele Text in the City of Gods.
Combining his inherent "Buddha Attribute," he could release a kind of solar energy.
Now, Gu Xu was an undeniable Sun Priest.
The solar energy he released could effectively restrain the Dark Power from the 'lower end.'
In the backdrop of Ancient Egyptian mythology, "Night" was seen as the endless darkness brought by the underworld serpent, Apophis.
The reason that the night recedes and the sun rises anew each day is that the "Sun God-Ra" defeat this demon snake attempting to devour the world in his divine vessel.
It was because of this.