Deeprealms

The Deeprealms are a location in Fire Emblem Fates

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The Deeprealms are a series of areas in the astral plane. With the war between Hoshido and Nohr causing many hardships in regards to raising an infants, so most infants are sent there in hopes of keeping them safe. However due to the accelerated time flow of the Deeprealms, babies raised in that realm quickly mature into young adults in a matter of days. All children of Fates are raised in these realms and reunite with their parents after they have become of age.