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.fr: Royaumes mortels et immortels
examples
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The stage was set for a war that would transcend the boundaries between the mortal and immortal realms.
La scène était prête pour une guerre qui transcenderait les frontières entre les royaumes mortels et immortels.