The Good Guest

Question: Where did you find all your information on Radegast? I've poked around everywhere, and in pretty much everything I've found, if it doesn't dispute his existence, it labels him as a sun deity, like Svantovit.

Hey, there, good question! Most of the material on Radegast in the Bogovi supplement comes from Ivan Hudec's Tales from Slavic Myths, a pretty awesome book that was just translated from the Slovakian in the early 2000s. It's hard to come by and pricey, but a great read (with some awesome art, to boot). Hudec's the former Minister of Culture of Slovakia, and the book was officially endorsed by the Slovak Academy of Science's anthropological division, so I feel pretty comfortable believing that they might know something about Slavic myth in the area that English books, often based on much older English books because it's hard to get original source material, might not. Much of the book focuses on western Slavic myth (Slovakia, Slovenia, the Czech, Germany) instead of the more familiar eastern/Russian myths that most English texts I've read on the subject focus on, so that might also contribute to its different perspective on some deities.

I haven't seen much that I thought was too legit on Radegast as a sun-god (there was a period where Slavic scholars decided pretty much everyone was a sun-god, it seems), though I have frequently seen the theory that Saxo misinterpreted a shrine to Svantovit and invented Radegast based on the place's name. Then again, there are English-speaking scholars who dislike that theory as well, noting that it's much more likely that the place was named for the god than the other way around, so it's a murky area.

If you're not comfortable using Radegast as a god, you could always boot him from the roster in your games and instead stick with the Radegast Terra Incognita provided in Scion: God (though I would definitely not recommend anything else about that adventure, as the myth of Svarog fighting a dragon named Zmey - which is just the Slavic word for dragon, not a character I've been able to find in any source - is, as far as I can tell, an internet fabrication from the modern Slavic pagan community).