Warhammer 30k and the Great Tomb of Nazarick

Description

An unclosable portal was discovered in a church in the Slane Theocracy, which was about to be destroyed by the Great Tomb of Nazarick, connecting the world of Warhammer 30K.
So Warhammer meets the Great Tomb.
Ainz Ooal Gown: Damn it, I have become a native!

PS: The original work is an expansion of my answer in "What would happen if the other world in "OVERLORD" was discovered by the Human Empire during the Great Crusade in "Warhammer 40k"?"
The original answer has been completed. Many plots of this fanfic have been modified and are not consistent with the original answer. I hope you will support me.