I don't know the author of this 'Death of Kings: A Novel' without looking it up. It could be a relatively unknown author or someone well - known in certain literary circles.
It could be about the fall of kings. Maybe it delves into the last days of certain kings, their mistakes, the conspiracies against them, and how their death impacts the kingdom, its people, and the political landscape. It might also explore the cultural and social changes that occur as a result of a king's death.
Well, in 'good kings bad kings a novel', a significant theme is probably the impact of rulers on the lives of their subjects. Good kings might bring prosperity, justice, and stability, while bad kings could cause chaos, poverty, and oppression. Also, the exploration of human nature is likely a theme. It could show how power can corrupt or ennoble a person, as seen through the characters of the kings in the story.
I recommend the novel <Divine Martial Sacred Soul>, Ye Feng's codename Death God was one of the main characters, there were also eight Godly Kings in the storyline. I hope you like this fairy's recommendation. Muah ~😗
The kings themselves are likely to be the most interesting. The good kings with their noble deeds and the bad kings with their villainous acts can be really engaging characters.
I haven't read it yet, so I can't give a detailed account. But generally, in a series like this, there might be elements of fantasy, like dragons which are often associated with magic and power. Maybe the 'dragonfire' is some kind of special power or event in the story.
There's no way to know exactly who the two kings are without more context. They could be fictional characters created for the story, or they could be based on historical kings from different regions.