The Vaati, also called the Wind Dukes, were beings of law and elemental air, a race of powerful primordials from the times before the Dawn War.
The Vaati eventually came to lead/rule the largest empire back in the "elemental" days, an empire that included the aarakockra and other elemental beings.
Empire lost when Vaati gave everything to save the cosmos from Chaos (Queen of Chaos/Mishka/Rod of Seven Parts).
Changed by their battle with chaos, many vaati were infused with other forms of elemental power, and their descendants eventually became the other species of djinn.
Remaining Wind Duke communities are fading and isolated.
Noble Genies of other species have Vaati bloodlines somewhere in their heritage.