Proto-Indo-Europeans Second Society of Fairies.
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However like nature fairies are fickle. The apsara of India who lived in the forests, lakes, rivers, trees and mountains loved to sing and dance could be dangerously so. Their beauty hid a certain amount of malicious glee and they would often leave humans mentally deranged.
The Nymphs of Greece and the fairies of the Celts too would dance through the forests, playing and laughing with childlike glee as if never able to truly grow up and they too could leave those they encountered insane. But perhaps the most fickle of all are the rusalky of the Slavic peoples who are known to tickle humans to death.
The male counterparts to the nymphs and the apsara were equally as playful, equally as musical. Among the people of India the part horse or bird gandharva were said to guard Soma, the food that made the gods immortal. They aren’t all play, however, for they act as messengers between humans and the gods.
The satyrs of Greek mythology too were originally depicted as having horse tails but through encounters with the Latin peoples who’s Faunas was part goat they too became part goat. By the time fairy tales and myths were collected in Europe nearly every European society has a forest spirit with goat legs. The Leszi of the Slavic peoples were the ultimate bachelors just as the satyrs of Greece were; causing and getting into trouble from too much drink, chasing female humans and fairies around the forests and generally acting rowdy. The outlier in all this are the Glaistig of the Scottish Celts, who are beautiful females with the lower half of a goat. Still despite their gender their role appears to have been similar as nature spirits which herd cattle and love song and dance but which are dangerous for they unlike the others drink human blood.