I recently read a short story by Stirling (in Turtledoves alternate universe collection) set in The Peshawar Lancers universe. In the very beginning, he mentions Chernobog cult.
This kind of threw me for a loop, since I only associated Chernobog with Mercedes Lackey Heirs of Alexandria series.
Upon further research, the use of Chernobog seems to be pretty popular in fantasy - in my impression, way more popular than is warranted given that the entity was a minor, virtually unknown power in an obscure part of Slavic pantheon (there were a lot more well known and popular deities if one wants to borrow from ancient Slavs).
Is there any explanation for Chernobog's popularity?
Is there some known influence that people copy? Did any of the creators using Chernobog in their work explain WHY they picked Chernobog specifically?
I'm looking for facts/evidence, not guesses.