Realm of the Underdark, deserted, the Goodly Realm
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This realm is the site of the great stone circle at Maraka, with its' inbuilt Sancrist Crystal which generates a beatific field of pure good. No evil creature can endure the place for long.
Some theorise that this was too much to cope with for the inhabitants of the realm, and contributed to their downfall. The entire realm is deserted except for occasional travellers from the Planes of Good.