Hey MAHak. Thanks for the ideas!
-Give the vampire a bonus to movement speed, the bonus should increase the more hungry he gets.
I like this idea. Gives you a bit of a boost for getting to your next bite.
-Add a charm skill (once per combat), the chance to set it should decrease the more hungry the vampire is. After all a frothing starving bestial vampire desperately craving blood is not very charming.
I was considering adding a charm skill. I'll have to see if I can modify the hit chance by script, and if not, I may be able to link the charm status to a spell effect. If all else fails, charm could be tied to the Well Fed hunger status, so once you lose that, you lose the spell until you feed again.
(Wacky idea) a vampire can't use the bedroll, but can use a coffin.
I like it, haha. Perhaps the first game has a hint as how to do that, as I remember one of the mods I was using had a coffin for a bed, for healing when undead.
Should not get any bonuses from food and healing potions only heals 50% of their normal value. Can't have the rested status. Should he be considered an undead, meaning the effects of healing and poisons are reversed?
Currently, you gain the "Zombie" talent when you turn (it's the talent Undead have that makes healing harm you, and poison heal you). I went with this due to the fact that making healing harm you may be hardcoded in. I may be able to get around it by applying a decaying touch status permanently, but I'll have to do some testing to see if I can remove the visual effects of decaying touch.
I'm using DND5e's Vampire race as a bit of a baseline to work from, and the undead effect may fit in well with that vision for vampires:
Unholy Body
Dark magic runs your life force, therefore you become immune to necrotic damage and instead gain health equal to the damage taken. You are vulnerable to radiant and fire damage.
Health potions and healing do not have a healing effect on you. Instead they deal poison damage equal to the amount that was meant to heal. To heal you must either drink blood, or be the target of a spell meant to deal necrotic damage.
On top of that, I've made Vampires immune to bleeding and suffocation, like the non-player Undead in the game.
Also, when your vitality takes a hit, you don't spill blood.
You do heal from blood surfaces though, and it works better than Leech - You gain some passive regeneration in blood, and you don't remove the blood surface by standing in it. If that ends of being too strong, I may have the surface get cleared after a couple of turns.