To give you an idea of how dangerous and terrifying, they make a threat where if they aren't given what they want, they'll tear apart the world. Considering that they can fuck with... spacetime... or something... and can basically manipulate whatever they want, everyone quickly capitulates. Also, going from that episode, probably... NOT... a good thing to be associated with or be an emissary/ambassador/plaything of fairies. Just don't take the chance.