As the name suggests, a "wind spirit" is an elemental spirit of the wind, naturally born and capable of manipulating the wind elements within the cultivation world.
If tamed and bound by a contract when the wind spirit is newly born and its nascent consciousness is just forming, the cultivator will enjoy a high affinity for wind spiritual energy in all future Cultivation and can wield the power of the wind to a great extent.
Similarly, the five elemental spirits of water, fire, wood, gold, and earth all possess corresponding abilities.
Chapter 271