Wars and kingdoms are always fun settings to read about, so I look forward to seeing what you do. It's always interesting to explore the dynamics between royalty, loyalty, and peasantry as a kingdom attempts to work in tandem with itself. I think the "fury of injustice" works decently as a hook, since it hints at a number of things going on without needing to explain them directly.
It sounds like you have a solid starting point for how the story could play out. One thing that's unclear based on the title and description: are you playing as Monty Solomon or are you playing as the newborn son (once he gets older)? Or someone else entirely? There's different pros/cons to that. The other question being: is this upcoming war with someone outside of the kingdom, and is the internal strife a separate smaller parallel matter? Or is the quarrel between king and kingdom the war itself described in the description?
I think a story built around Monty Solomon's perspective could create a more concise and focused plotline, especially if this is your first storygame. Or writing a story based around the King's son when he's old enough to be a factor, would allow for a lot of different elements to be more open-ended, which would also work well for a larger CYOA.
It'd be worthwhile to flesh out the two Dark Wars that happened before the actual story takes place, if you haven't thought about it already. This doesn't necessarily need to be done in the description, but can be more subtly told through the story itself. How the wars happened, why they happened, how long they lasted, why they're called the "Dark Wars", and how they concluded. Since the Aloris Kingdom survived them, we can assume they either won the wars or simply didn't lose (if the wars concluded by other means). Small details like that will help explain why a third war could happen.
Since this appears to be your first storygame, it's important to have a strong focused theme and direction to make sure you can finish it. It's easy to get overwhelmed by the number of what-if choices that can branch around. It can be good to have a smaller storygame project to start with and get feedback on, to practice the CYOA medium and prepare yourself for a larger scale project. Having an outline of major decisions and branches ahead of time can also help with the writing process.
As Steve said, there's too many vague things in the description to understand your overall plan for this. You'll get better feedback on your ideas if you share more details about the story.
