Cthulhu Mythos In Cultivation World
It would be very troublesome if the other world considered them as invaders.
As for the Emperor, who only wants new territory, resources, or wealth for his family and empire. The fact that he has the potential to establish a connection with the government of another world is considered a success in itself.
According to the info from the soldiers of another world compared to the info from Aurelia, it seems like these other world soldiers came from the place called Qin Empire that he could consider having the same culture as them. Also the people of that world, even the strongest warrior is not stronger than the mortal in this world. At most, they would have the same power as the spirit warrio