Fan Di thought, after Pang Jian entered the Dark Prison, he would have trouble encountering Pang Jian again and assumed Pang Jian would not return.
As a god spirit like him, if one has the capability to enter other realms, isn't one supposed to plunder and collect the rarities of a world?
Since Pang Jian could enter, naturally, he could also leave.
He could completely seize the items he fancied before the powerhouses of that realm reacted and then leave in due time.
If there wasn't a being stronger than him in a realm, he could lord over the land and cultivate the wisdom race within, making them see him as a god spirit.
When the god spirits from the Outer Star River enter a realm with "World" in its name, they often do just that.
Such events also frequently occurred in the Ancient Demon World.
Fan Di had only heard the legends of the human race's gods and hadn't been in contact before. His understanding of the human race's gods was limited.