The folklore faerie of the popular imagination — helpful, luminous, inclined toward godmotherhood — is a sanitizing revision so thorough it constitutes a coverup. The creatures encountered in field notes across four centuries of rural record-keeping bear no resemblance to that invention. They are small in the way that wasps are small: not harmless because of it. They bite with serrated mouth-parts designed for tearing fungal skin from the substrate of the forest floor and they will use this equipment on you without hesitation or remorse. The sting — for they also sting, a different appendage entirely — produces a numbness that begins at the puncture site and works inward. Several recorded subjects reported that the numbness reached their memories before it reached their extremities.

They congregate in threshold spaces: the moment before dawn, the edge of a property line, the inside of mirrors. They are drawn to music, particularly music played badly and with great sincerity, which they find irresistible and will follow for miles. Do not play the fiddle alone at night. They will come. They will stay. They will rearrange your house in small ways that you will not notice until you have gone entirely wrong.

The canonical illustration places the centaur as half-man-above, half-horse-below — a convenient fiction. In truth, the centaur is not a hybrid. They are old enough that the question of which half is primary has been answered by age alone: they are horse. The human torso and face are the younger addition, the evolutionary experiment, the appendage. When centaurs gather and believe themselves unobserved, they orient toward one another horse-first. It is their faces that meet. Their human eyes are secondary sensors; it is the pricked ear, the widened nostril, the tension in the hindquarters that constitutes their true attention.

They are eternal — not immortal in the sense of being unkillable, but in the sense that they have never, as a species, experienced a period that was not this one. They do not age in any direction. They remember things that occurred before the current configuration of the continents. This makes conversation with them difficult to sustain and deeply disorienting. They answer questions about the present with information about geological processes. They are not being evasive. That is simply where the relevant context begins.

They are not violent by default, but they are territorial by instinct, and their territory is measured in days of riding rather than acres. Do not camp in a meadow that smells of them. Do not attempt to shoe them. Do not, under any circumstances, ask them about the future — they do not experience time in that direction and the attempt to explain this to you will take longer than you have.

Encountered primarily at dawn in low-lying ground near water — fields, fens, the fog-held valley at the edge of farms — the Milk-Maid apparition is not a ghost in the conventional sense. She is not haunting a location because something happened to her there. She is haunting a function: the labor of the early morning, the repetitive and necessary work of tending what must be tended before the world wakes. She carries her pail. She moves with the patient rhythm of someone who has done this ten thousand times. She does not look up.

The danger is in the looking. If you observe her from a distance, she is simply there — mist-white, slightly luminous at the edges, moving toward the barn that is no longer standing. If she looks up and sees you, the situation changes. She does not chase. She does not threaten. She simply holds your gaze, and you will find yourself walking toward her without having decided to, across wet ground, into the fog that thickens around her as you approach. Those who have been retrieved from this approach report having felt entirely purposeful. They were going to help. They were needed. They did not question where the barn was.

To compile a single entry for witches is an error of taxonomy comparable to compiling a single entry for humans. There are hedge-witches who work in the boundary between garden and wild, who bargain with plants and keep their word about it, whose cottages smell of damp wool and something sharper underneath. There are sea-witches who have made agreements with currents and do not age in the conventional direction, growing younger in some features as they grow stranger in others. There are bone-witches whose practice is forensic and funerary; they are the ones called in when something died wrong and the dying has continued. There are market-witches who work in commerce and exchange, whose prices are always fair and always somehow more than you intended to pay. There are witches who inherited the practice and witches who arrived at it through catastrophe, and the distinction matters enormously to them and very little to the outcomes.

What they share: a relationship to the seams of things — the place where one condition becomes another, where night becomes day, where living becomes dead, where love becomes obligation. They work in these transitions because transitions are where the material is loose enough to work. Do not mistake them for service providers. They are not. They are craftspeople with standards you will not always find convenient.