I am really not liking that king. leave him 2 rank 3s and only provide rank 1 and 2s after this. I look forward to those noble's faces after the battle.
I hope he Vulcan takes over this kingdom and also has a side quest of finding orphaned children and aiding them sort of like a father or older brother so he can experience once more what it's like to have'em
I would just kill all the nobles after this and take control of the empire since all the nobles are already here, it would be easy, gold rank sentry , maximum energy blast and vualĂ .