Not, you understand, a good novel. A trashy, cliche-ridden genre (fantasy) novel. Mostly because I wonder if it really is that easy to turn the crank on something like that.
underappreciated protagonist + threat to world + one major exotic and illogical custom + dragons and/or magic + Twue Wuv = Bog Standard Fantasy novel
The major threat is that I'd decide, halfway through, that I should really do this "right" and go back and try to write something sensitive and interesting that explores neglected themes in fantasy, like motherhood, community, or non-erotic love. And then I'd get all invested in it and stuff.