A Fantastic Novel
Your story was fantastic Erin! The Rising Sun was one of the first stories I read on Inkitt, and I have to say I don't regret the three to four days I spent pouring through the story.
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Probably the biggest strength I see in your writing is your characterisation of Eliana, Oriens, and the rest of the book's characters. You spend the time to really flesh out your characters - you give them a history/upbringing, you give them a personality based on said upbringing, and you give them motives and purposes that make sense when drawn from the character's past. I also like your method of writing dialogue. Many fantasy stories I've read have strong period language (I've been guilty of it myself), so it's refreshing to see a fantasy story that isn't so heavily steeped in rustic language. That's not see your dialogue is ill-fitting - I think it is simple, straightforward, and flexible enough to enhance your characters' nuances without being bogged down. I especially like Oriens - he alone made me laugh quite a bit. Though he is a wise character who wishes to help his rider, he isn't above poking fun at her once in a while (and Eliana, likewise, returns the favor). Oriens actually reminds of Sapphira from Christopher Paolini's Inheritance Cycle - except, well, funnier. X)
Now, if I had to pick any areas for you to improve on for the future, I'd say there are two places that need work: the plot and the antagonists. The plot...isn't bad, per say, but it's pretty standard fare for a coming-of-age fantasy tale. While the story was enjoyable thanks its characters, I found myself accurately predicting most of the events and twists in the story. In this regard, the only advice I feel I can offer is to perhaps expand on the world a bit more - weave more intricate lines between different factions, create reasons for things to not go so smoothly for the protagonist. For example, I felt that the dwarves were a bit to sudden in allying with Eliana. Yes, she is the first dragon rider in forever, but because the dwarves have been so secluded beneath the surface for so long, I was expecting a bit more resistance to suddenly jumping into a war on the surface. Maybe the dwarves could be skeptical of Eliana's powers, and would have her do a quest for the king to prove her worth? Just some ideas.
In addition, I felt that the antagonists didn't get the same fleshed-out treatment that the protagonists did. Nocens seems bad just because, with absolutely no redeeming traits, as does Peior. And while Ater at least has some explanation for betraying Eliana, Iocus comes completely out of the blue. Granted, there's been suspicion building up about Iocus throughout the story thanks to his "forwardness" with Eliana, so his turning evil isn't entirely unexpected. That said, I don't think a motive is ever given to Iocus's betrayal, just that he was evil all along.
Anyway, those are my two very long cents on The Rising Sun. Despite the flaws I still think you have a great story on your hands, and I greatly respect you as a fellow writer for accomplishing so a big milestone. Thank you for all your hard work, Erin, and I look forward to reading the other stories in the Sky Riders series. :)