No, no, don't stop healing the paladin; stop healing *anyone*.
The rest of the party didn't stop the paladin slaver or the werewolf murderer, so they are complicit. If they are willing to take a stand with you against the evil then they can once again get the blessings of your god. If not, then they don't.
This is a bit more extreme than I think he would be comfortable with. To be fair, here's the rest of the party.
Tiefling Assassin (Who has been the guy breaking up the fights and trying to talk reasonable middle road to us)
Human Druid [used to be a fighter] (Is becoming more aware of good and evil [roleplaying a confused 16 yr old kid very well] who used to see the Paladin as her Big Sister and protector, but as the Paladin has been descending has become more and more scared of her)
Orc Barbarian/Wizard (whose mostly been rping confused and wanting to stay out of it)
So the rest of the party is for the most part, caught in a very awkward position. I think they agree with my character (and my character has no problem with how they've reacted) but they are seeing two friends and traveling companions trying to kill each other, and they don't know how to keep the peace.
I don't know if my relatively peaceful doctor would be comfortable withholding healing from people for what is at worst agonizing neutrality. That'd feel despicable I think, to hold his resources ransom if they do not agree with him.
Yeah, I would have your gnome leave the party.
Then make a chaotic evil character and show them what true evil is!
Also, where's the bloody DM in this story? Is he/she just sitting back and enjoying all this intraparty conflict? Cos this doesn't sound that fun!
It's evidently fun for this DM.
In-character, I would walk away from the party. Out-of-character I would walk away from the game. But that doesn't suit the OP.
I'll repeat, we are still having a degree of fun with this. I was grinning the whole time while arguing about the morality of this act with the Paladin. The issue is, I'm running out of ideas to prevent this from devolving to the point where we need to roll new characters, that's why I'm trying to brainstorm solutions my character can have in his back pocket for next session.
I do have a few ideas for a new character if I had to make one though.
I'm not going to advise you what to do as a Player, as far as the game goes, because each person has to decide for themselves if the game is worth playing. I have some advice for you for your Character, however, should you continue.
The Ranger and Paladin are obviously not worthy of your divine magic, and it would be an insult to your god to do so. You should NEVER provide them magical aid again. This means no Healing, no Restoration, no Resurrection, no Buff Spells, Nothing. If you drop an AoE spell, ignore them for purposes of placement (they are not your allies). If they have a problem with this, too bad, because you follow the precepts of your god, whom they defy. This may push things to a head (i.e. combat), but it keeps you from being a pushover.
As for the vampire slave, both are evil. Slavery is bad, but so is vampirism. Unless you can find a way to cure her (which would be for the DM to decide), you should destroy her. I would wait until the party is asleep, then attempt to destroy her (she may even be willing, if she never intended to become a vampire).
I would talk to the rest of the party, and see if any of them are willing to take charge and work as a mediator. If both you and they are willing to listen to the mediator, then you can continue to work as a group. They won't listen to you (and you probably won't listen to them), so the third party is going to have to make the final decisions. Otherwise, I would see if you can get any allies from the rest of the party. They may not aid you immediately, but any assistance they give you when the eventual combat begins will be invaluable. And yes, I think another battle is inevitable, as long as the characters are together.
We all have Bags of Holding, which is where I imagine she'll keep the vampire when she isn't using her services, to prevent daylight immolation.
And I did talk to the DM (I critted vampire knowledge) and he said the only way to reverse vampirism is to kill them then raise them, which leads back to the problem of needing to kill them first. I also can't use Dispel Magic to counter their Channel Divinity effect. That's what started me thinking about posting this thread, is I figure there has to be something I hadn't thought of or seen on the magic front.
There, just last night, has been talk of trying to set up a conflict resolution thing within the party, like a coin flip, to prevent this from going to a physical fight, and mediators is where I'm leaning. But, will that prevent a fight or merely divide the party further?
Before the showdown comes, think out your tactics. Aim to take control. No more Mr. Nice Guy. For example:
Suddenly announce out of the blue that evil cannot be tolerated and start buffing yourself. Let the other players assume that you are about to attack the paladin. When you are ready, do the unexpected and kill the evil ranger. Don't hold back, go in all spells blazing and go for the kill. Don't let the others stop you. Keep hitting until the ranger has failed all three death saves. This is for real.
Then heal yourself up, calmly look the paladin in the eye and say, quietly and matter-of-factly: "You're next."
Your deity will be proud of you.
The party will descend on me before the ranger falls, especially if I instigate a fight with no provocation. I'd be slaughtered quickly and have to fight the whole party.
Also... The gnomish dieties are more about harmony and community than smiting evil in the face... So I don't know if they'd be proud of a sudden unprovoked kill.
If it does come to a fight, I won't hold back til they drop, but landing that finishing blow... I don't know if he could do it. Not yet.
And thank you guys for all this, it's definitely helping me work through the problems and re-analyze the situation.