Calcu (Kalku)

The source summarizes the kalku/calcu as a role within Mapuche tradition but does not record a specific mythic origin tale. The available account frames the kalku as a named category of practitioner in Mapuche cosmology distinguished by engagement with harmful spiritual forces; no creation myth or origin narrative for the role is provided in the cited material.

The cited source does not provide any description of corporeal appearance, dress, or distinguishing physical traits for the calcu/kalku. Descriptions in the available material treat the kalku as a social-ritual figure characterized by the kinds of powers attributed to them rather than by a fixed visual stereotype.

According to the source, the kalku/calcu "works with black magic and negative powers or forces." The account presents the kalku as a practitioner who engages with dangerous or malign spiritual agencies and contrasts this activity with the "essentially benevolent shamans" called machi. The source does not enumerate specific spells, techniques, familiars, or mechanisms by which the kalku exercises such powers.