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A rest Age is a place intended for recreation. They are typically prefixed with eder, the D'ni word for rest. Because early Ages prefixed with eder were garden-like, eder in this context is occasionally mistranslated as meaning garden, as in "garden Ages".
Many such Ages were written during the Garden Binge of the 8100s DE.
Known Rest Ages
The eder tomahntee are rest stops between Earth's surface and the D'ni caverns, mandated due to the long trip.