Between A Knight of the Seven Kingdoms, an Eragon series at Disney+, a Fourth Wing adaptation at Prime Video, and more, we're on the cusp of an expensive new generation of fantasy shows. And when they all start airing, studios will have to deal with something that didn't used to be a factor: the authors who wrote the books that these shows are based on are far more willing than they used to be to call the series out when they start deviating from the source material.