Earth Avatars were traditionally identified by directional geomancy, a series of rituals designed to winnow through the largest and most populous of the Four Nations as efficiently as possible. Each time a special set of bone trigrams was cast and interpreted by the earthbending masters, half the Earth Kingdom was ruled out as the location of the newborn Avatar. Then from the remaining territory, another half, and then another half again. The possible locations kept shrinking until the searchers were brought to the doorstep of the Earth Avatar child. It was a quick way to cover ground and
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