I like the balanced mechanics here. If I use two dice a day, I will have six on the last day, or three dice a day and only two on the last. IF. And the story/setting is intriguing. Rings faintly of Greek or Roman mythos, where no one is overtly angry the tyrant is dead, but someone must be scheming because they all want the throne. Plus you used mostly Roman names, soooo...
The only question I have for when I play this is how to decide the Domain each day. If there were six total persona to bear, then that's easy. I'll have to add them and see how that works for balance. Maybe Day and Night Domains and divvy that evenly amongst the players.
Very nice!