Just a random note, but it's been stated that dragons are a beast tribe and have a primal of their own.
As for the war of succession, it is also mentioned that the rebels overestimated how much it would disrupt the imperials, which led to Dhoma being destroyed in the failed uprising. If anything, I'm inclined to think that there is a new emperor... And it's common to send political rivals off on expeditions of conquers to get them out of the way.