I was wondering if people know of any books which are generally solid fantasy (like A Song of Ice and Fire is), in the basic swords and castles setting or something similar, but are considered some type of science fiction? I ask because I'm a writer and I'm writing one. I wanted to know if it's been done before, or anything similar. The general idea I had was there's no magic in it. It's just a primitive society. However, the planet's much older than Earth, so evolution has taken certain organisms in odd directions. There is, for example, viruses that turn people into giants, or such, enhancing their strength. Makes sense? It's science fiction, because it's based on evolution and stuff, but it's a fantasy world. Seen it before? Let me know. Thanks.