[Sombre]

Yes, but with dom3 nations you have similar things which are left pretty open - such as the God Mountain and spider transformations of Machaka, the demons in the heart of Marignon, the 'death' that is kept in the vaults of ermor, what exactly is behind the seal of Agartha etc

It might be enough to simply say that the damsels are beings heavily influenced by fay magic and that the fay have long had a hand in Bretonnia's destiny. Fay could be interpreted to be faeries, wood elves, Tuatha, dryads, lamias or who knows what else.

I'm sure you'll come up with good stuff so I'm not worried or anything, I just don't think warhammer nations need much in the way of bending to fit in dom3, which has quite a vague and mysterious setting anyway (it has no map, for example, so warhammer countries can happily exist within dom3 and be referred to be a lone mod nation without being too jarring).