Warhammer 30k and the Great Tomb of Nazarick

In a church of the Silan Theocracy that is about to be destroyed by the Great Tomb of Nazarick, an unclosable portal is discovered, connecting to the world of Warhammer 30K.
So Warhammer meets Great Tomb.
Ainz Ooal Gown: Oh no, I'm a native!

PS: The original work is an expansion of my answer in "What would happen if the alternate 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 fan fiction have been modified and are inconsistent with the original answer. I still hope for your support.

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