Rusalkas are water spirits from Slavic folklore, who appear as a pretty young girls with long hair. In some versions of lore, Rusalkas are the souls of drowned women or unclean spirits who lure men into water, and drown them by entangling their body with their long red hair. Image: Ivan Bilibin
Alchemist and Magician Edward Kelly, in the act of invoking a spirit of the dead at the churchyard of Walton Ledale, from “The book of black magic and of pacts” by A.E. Waite, 1898. The companion in the circle is likely Paul Waring, who helped him with all of his conjurations.