Air Troll

Not to be confused with normal trolls, air trolls are trolls made of air. They can be quite notorious for being significantly smaller than their other troll counterparts, particularly when it comes to mass but also when it comes to perception. They decidedly make use of the stereotype wherein a smaller person simply has less space to fit the same amount of rage.
Generally, air trolls are capable of flight and a kind of minor sedative magic to keep their prey more docile. They prefer the hunt to eating their prey and it's unusual for an air troll to kill its prey. Just hunt them down and catch them, in a way you might expect from something that is essentially a sentient cloud. They seem to have a preference for food that is either canned or rotten or freeze dried.
Trolls have things they are meant to safeguard. This is not always convenient for people who needed to use the thing that is being guarded.