Vampire Queen with 36 hit points?

[Endoperez]

The extra hp from life drain are just extra - the maximum hitpoints won't change, and the extra points will wear down in a few turns unless she finds new victims.

The hp from positive dominion goes down if you go to province with less dominion, and the bonus goes negative in negative dominion. However, the change comes about a turn later than the battle, so you can fly from +4 positive dominion to -3 negative dominion and get the bonus hits from +4. I don't remember if you have hp malus from -3 dominion or if your hp just starts to drop towards [max - malus from negative dominion], changing in few "steps".