A djinni can fly/float. It is humanoid. It is poisonous if eaten.
The djinn are genies from the elemental plane of Air. There, among their kind, they have their own societies. They are sometimes encountered on earth and may even be summoned here to perform some service for powerful wizards. The wizards often leave them about for later service, safely tucked away in a flask or lamp. Once in a while, such a tool is found by a lucky rogue, and some djinn are known to be so grateful when released that they might grant their rescuer a wish.