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Urithiru displays a number of unusual properties that allow humans to survive despite its high altitude. It is believed that these systems are somehow powered by or related to the spren known as the [[Sibling]].{{epigraph ref|sa3|87}} However, at some point the Sibling withdrew from mankind and currently slumbers.{{epigraph ref|sa3|70}}{{book ref|sa3|111}} This may explain why many of Urithiru's systems are currently non-functional.{{wob ref|9498}}
Functioning fabrial systems include those for increased pressure{{epigraph ref|sa3|69}}, temperature{{book ref|sa3|53}}, and general conditions encouraging plant growth.{{epigraph ref|sa3|69}} Navani also theorizes that the air circulating through various shafts is powered by some sort of fabrial.{{epigraph ref|sa3|28}} In addition, the [[fabrial]] elevators connecting Urithiru's floors begin running when gemstones are inserted
Non-functional fabrials include the plumbing and sewage systems, though pipes for these are present.{{book ref|sa3|104}} Taravangian theorizes that fabrial lights were used to increase plant growth and crop yields to make the tower self-sustaining.{{book ref|sa3|i|5}}
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