When the Rift happened, many fae were displaced into the mortal realm – along with pockets of Faerie. Some fae decided to leave Court affiliations behind and became Solitary. After the great battle caused by Morrígan that led to the Tithe, these Solitary Fae had to choose a Court to pay their tithes to in return for protection and the right to live on Court lands (all of the mortal realm was divided between the two Courts).
Solitary Fae come in many forms and sizes. And though interfering in the lives of mortals isn't advisable (the Compact makes things tricky), some enjoy toying with humans.
*Thank you for reading. I hope you've found this informative. Don't hesitate to comment and vote. For more, go to my blog Ronel the Mythmaker to learn all you can about these fascinating creatures.*