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...once moved a mountain because it obstructed the view from his tower. Nobody has managed to do the like, before or since. Because Stammelford, so they say, had the services of a d'ao, an Earth genie.
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- pg.251, The Last Wish (UK edition)
D'ao is the name for the elemental genie of Earth. Herbert Stammelford, a mage, moved a mountain with the help of a d'ao, according to legends.

They were mentioned in the short story "The Last Wish".