Two years ago I made a post how I got a handle on how faeries work in my setting. The basic issue is that there are multiple interpretations of why faeries are what they are in myth and legend. This means in order to roleplay faeries there is no definitive source for the referee to use. Many of the major ones didn't click with me until I came with the approach I outlined below. I like it because it preserve the mercurial and seemly random nature of faeries but provides a consistent starting point for an encounter.
I collected the Faeries entries from the legendarium I am working on for my Majestic Fantasy RPG and posted it as a PDF here.
Magic in the Majestic Wilderlands is the force of creation made manifest. Before the creation of the Abyss and the Chromatic Crystals, the inherent level of magic was low. In order to be harnessed as a spell, it was laboriously gathered in a ritual and infused into a scroll, charm, or magical device. After the creation of the Chromatic Crystal, someone with a disciplined will could cast a spell without the use of a device.
Over the centuries magic did not turn into a science or craft because it was influenced by an individual’s emotional and mental state. What worked for one individual, often didn’t work for another. This susceptibility of magic to emotion had another consequence, the creation and evolution of faeries.
Faeries are creatures, and monsters born out of the ambient level of magic that flow throughout the Wilderlands. The emotional life of elves, men, and even plants and animals give birth to these creatures including the faeries that developed sentience. The nature of their birth has left all faeries with a singular drive to recreate the emotions that give them life. This typically manifests with the faeries using their abilities to recreate the circumstances of their birth. Using magic, to manipulate the environment and those around them into playing out certain stories and emotions, over and over again. This can led to dangerous situations when emotions like anger, hate, and fear are part of the faerie’s nature.
The key to dealing with the Faeries is to understand the emotions and stories that gave them birth.
The Elves and the Faerie
When the Wilderlands was created there were two sentient races; Elves and Men. The Elves were born as the glory of the Wilderlands, as a shining example of the potential of life. They were given great gifts however the price was that their fate was tied to the Wilderlands. One reason is the innate magic of the Wilderlands sustains their immortality and other gifts. Because of this, the elves feel kinship with the faeries, and in general will help them fulfill their nature. For the faeries that have the negative emotions as their nature the elves will still help them but try to do it in isolated locations far from the other races of the Wilderlands. Many elves realms have a large population of faeries.