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The Urgals here are humans with tattoos rather than horned orcs.In the film, they are some sort of rotting dirty The Worm That Walks slash mummy creatures. The Ra'Zac in the books are wingless, insectoid birdmen, which are intended to be horrifying but still clearly recognizable as lifeforms.In the movie, time is compressed to a matter of weeks so a magical age-up was introduced. Adaptational Timespan Change: In the book, the story takes place over months to give Saphira time to grow up.Elves lack pointed ears and dwarves are not shorter than humans, which can make it hard to tell if they're even supposed All of the dwarves and elves are indistinguishable from humans.Apparently it was decided that make up or CGI to match the book was too expensive and time consuming. In the movie nothing about their appearance implies that they are inhuman, instead basically looking like human barbarians. The Urgals in the book are described as tall, large, grey-skinned Horned Humanoids, basically something like an Orc.In the movie, they summoned by Durza and rise up from the ground, looking like like some sort of dirty zombie mummy humanoids, apparantly created by magic. The Ra'Zac from the books are an already extant, ancient, inhuman race that has been hunted to near extinction by humans over hundreds of years, having a combination of insectoid and avian traits.Here, she's much friendlier and more expressive and seems to warm to Eragon very quickly, even expressing a hope they'll see each other again soon. In the books she's rather aloof and stoic, is a bit of a loner, and does not reciprocate Eragon's feelings in the slightest. Adaptational Personality Change: Arya is a notable example.His version from the film is still a jerkass to him, but only tells the Ra'zac about the stone after being horrifically tortured, which could even imply he actively tried to withhold the information from them in order not to endanger Eragon and his household. Adaptational Heroism: In the books, Sloan voluntarily told the Ra'zac about Eragon, purely out of spite and knowing they would probably kill or kidnap him.Meanwhile, in the movie he seems in control all the time, never loses a fight until the final battle (Eragon shooting him is treated as a minor inconvenience), and even takes out Saphira without breaking a sweat by creating a shadow creature even more powerful than her. In the books, he struggled in a duel against an untrained Eragon, got easily fooled by Blatant Lies about Eragon's true name, had to retreat every time Saphira joined the scene, and was even temporarily killed by a regular arrow. Durza himself is made a much more competent and resourceful character.In the book, Eragon only kills Durza with a distraction from Arya and Saphira giving him the opening to stab his heart.Her film version, on the other hand, is a gorgeous woman with sensuous manners and dressed like an oriental dancer. The books don't go out of their way to describe her, but they paint her clearly as a short woman with nothing more physically remarkable than a cute smile.