Pixys

Mischievous winged creatures, Pixys are an uncommon sight, and often considered a bad omen. Pixys are master herbalists, potioniers, and poison concocters. They live in swamps and forests, jungles and highlands; they swarm wherever Halflings call home. When fairies offered themselves as companions a little over three hundred years ago when their homelands were cut down, drained, or otherwise contaminated, Pixys looked down on their winged brethren and survived on their own.
Halflings, always been near Pixys, looked on with sympathy and devised a plan to help them, and thus the Contract was born. You can buy a Pixy’s service, called a Contract, for a hefty price and a name written upon a dotted line. One must remember to be precise in their wording when dealing with Pixys but know that once paid, Pixys are bound to that Contract and are forbidden to break it. To do so forfeits their protection from the Halflings.
Pixys are often a soft, spring green in color with translucent wings and hair the color of the sun or moon. Their nails are claw like and are said to contain natural poisons. It is said Halflings are the only known species to be immune to the pixy toxin. Their eyes are the color of fire and burn with passion. Pixys live in swarms: large multi generational family groups that have always nested near Halflings. Swarms vary in size and their populace can be anywhere from ten to ten thousand pixys.