mortal and immortal realms
definitions
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The distinction or duality between the physical world inhabited by humans (who are subject to death) and the spiritual or divine world inhabited by eternal beings.de: Sterbliche und unsterbliche Reiche
examples
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The stage was set for a war that would transcend the boundaries between the mortal and immortal realms.
Die Bühne war bereitet für einen Krieg, der die Grenzen zwischen der Welt der Sterblichen und der Unsterblichen überschreiten würde.