Anchimayen

The provided sources do not record a mythological origin story for Anchimayen. Sources note that the term is Mapudungun and that the creature is associated with kalku sorcerers; they also report that some accounts or later interpretations conceive of a connection or confusion between Anchimayen and the Mapuche moon goddess Kueyen, and that in some descriptions Anchimayen was later thought of as a fuego fatuo-type being. No account in the provided material presents a definitive origin narrative.

Sources describe Anchimayens as little creatures that take the form of small children and as beings that can transform into flying fireballs emitting bright light. Some treatments identify the fireball form with will-o'-the-wisp or similar luminous atmospheric phenomena. The sources do not provide finer-grained physical detail beyond the child form and luminous fireball transformation.

The documented abilities are: serving as a sorcerous servant or familiar retained by a kalku (Mapuche sorcerer), and transforming from a small-child form into a flying ball of light that emits bright light. Some sources describe (or later reinterpret) the creature as a fuego fatuo-type being that frightens and unhorses travelers; the sources do not supply additional specific powers, methods of control, or exhaustive behaviors beyond these points.