Stormlight-fed Farming

Rlain's gift to humankind: rockbuds and other crops cultivated on Urithiru's cold outer plates under the light of enormous chasmfiend emeralds while ardents drum the pure rhythms of Roshar. The combination of light, song, and spren — lifespren spin around the drummers and infuse the plants — sustains growth that the thin air would otherwise stifle, while gradually draining the gemstones as any fabrial does. SA:RoW:Ch 15