What? A real one? Not some nebulous thing I may or may not be contemplating?
Absolutely.
I wrote a short story recently as a means to see if I wanted to write a character's story. I won't be posting the story as there's stuff in there I want to use in the novel. At a later date I might post the story. For now, I am keeping it close. I have sent it to a couple people for feedback on the character and it has been mostly positive. Which is great as she's not entirely likeable all the time.
What's the story about, you ask? Did you? Ask, I mean. Well, right now I am only willing to say a powerful woman does good deeds that do not go unpunished. Also, there's supernatural creatures. Several. Of different flavors.
I am in the process of creating a playlist for this new project. So, yes, it is serious.