Okay, almost my entire party has gone evil, now what?

[Romnipotent]

Change nothing. Run you game as if they were good. But they will change how they react. I have a great DM for a Kalamar game and I've picked up one thing from him. PC to PC conflict is something that you let happen, most of the players wont become violent but will agree to disagree.

If the player can't play with the evil people out of character then I'd need more reason why, its just an alternate method to the means. You can be a tyrant and malicious but be doing it all for the good of a nation and its people. The Ends justify being mean.
Dont tell him and when he realises and goes off the handle interrupt him and remind everyone he's in character right now. Remind him when you think he's figured it out, he's in character. He may shut up and try to sabotage the party. The interparty conflict drives a lot of groups apart, I know, maybe the groups I'm with can handle the difference between in and out of character ideas. If I were a saboteur and a single PC found out I would dispose of him it were possible, the player would understand and if he harboured any anger towards me all I could do was explain that its in character, its my mission statement. Now, I have said the groups Im with understand death is a part of a game, alignments are guides not rules (unless you're a stubborn smelly lord holy pants paladin... silly people).

Example:
Good PC: Oh... my... (watch body language)
DM: A word in private please
Good PC: BUT!
DM: Now.
Good PC: whine whimper and cry

tell them that they're heavily in character and to consider all consequences of their future and immediate actions and that you will not hamper anyone from anything in character. That he is about to step into some mess, and to understand its all in character, not a bit of it is personally directed at you as a person.

and go back to the table, no discussion, no arguement. its a game, a game some people get banned for life from the RPGA for.

 

[Brother Shatterstone]

And I know that if he is told out of game there is no way he would be able to keep OOC information out of his gameplaying. What should I do?

Me personally, I would do nothing. I wouldn't let him know if its going to color his roleplaying.

As for what do you do when his character finds out? Well that's an IC (In Character) problem that is best resolved via the characters and without outside influence. (Why would you let wonderful roleplaying come to an artificial conclusion?)

Besides, if the other characters are as bad/evil as you seem to suggest then I would say the chance of this being a long-term IC issue is rather short.

 

[Romnipotent]

Why are you... Good PC
Its not what you think Evil 1
Yes, dont worry, we're just doing whats neccessary Evil 2
But you're skinning him!
And its needed, we have to sneak into a base, and the best way is to use his skin. They can detect magical means
ARGHGHHHHH Victim
HES STILL ALIVE!
We didn't have the heart to kill him
...And skinning him is perfectly fine?
Theres just one more thing, we're all to big to fit in the skin suit.
etc

You see the way its all panning out, I would be sitting there, leaning back just looking at them all, they would look at me and I would gesture for them to play it out. I am a judge, a story teller, and if they want their story to go that way thats up to them.
I like the idea that your not in a perfect world and my gamers aren't pandered by the idea that everyone in their group is a comrade to the end. But I keep saying, its very important to differentiate between group styles and persona vs personal. You are not your character you are a player of a character and at any point you or its life can be wrenched away by the drop of a 1.

 

[Charwoman Gene]

Y'see folks, this isn't just an IC problem. Just because something happens "In Character" doesn't make it cool. This is the type of situation that end in hurt feelings for players.

All the players save one have made decisions that make the campaign something that will make the game get REALLY unfun for the remaining player.

That "surprise reveal" may be taken as a betrayal.

TELL HIM.

If you are all RPers enough to handle evil maturely, than you are good enough to tell him.

 

[Numion]

All the players save one have made decisions that make the campaign something that will make the game get REALLY unfun for the remaining player.

The DM has to balance the enjoyment of the game for all players. In this case one player might not enjoy it, but the rest will. The DM has to make a decision: which is more important? Should the enjoyment of that one player outweight the enjoyment of the rest?

I don't have a good answer for that.

 

[Philip]

Just tell everyone that you have dropped alignments for PCs: then play on like nothing happened. If the actions of the other PCs didn't freak the 'non-evil' player out, I would hate for just the label EVIL to do so.

 

[Dakkareth]

Just tell everyone that you have dropped alignments for PCs: then play on like nothing happened. If the actions of the other PCs didn't freak the 'non-evil' player out, I would hate for just the label EVIL to do so.

Actually that might be the best solution so far. Maybe switch to the allegiance system (characters have one to three allegiances to persons, principles, etc. An example for a LE cleric could be AL: My God, (I desire) Power, Keeping my Word) - you could simply say that it makes more sense for human characters to be motivated by principles than by abstract forces of good or evil. Demons would still be [evil], because they are that principle incarnate, but no sane human being would serve the cause of abstract evil ...

Without alignments there's no problem between 'good' and 'evil' party members. Tensions will still arise over the goals and methods to reach them, but that can stay entirely IC without the big alignment lables.

 

[Angerland]

I agree with Charwoman. My friends and I play only once a week, and we do so to have fun more than anything else. If something happens to disrupt that fun we all feel bad. Maybe ask or remind the evil players that when your good player finds out they are evil that it will hit him very hard and seriously affect his game. You have to prepare for the good player to quit the game. You should decide if you don't mind playing your campaign without him, not because some real life circumstance takes up the free time he had to play and socialize with your group but because he basically got voted off the island. (stupid survivor re-runs).

The evil in D n D is supposed to be just that. Evil. If it wasn't there wouldn't be such absolute alignments, and changing them in game wouldn't come as difficult or with as much impact as the game puts on it.

 

[Voadam]

Also any general information about running an evil campagain.

Evil PCs have many of the same motivations as good ones, they like to go out, kill things, and take their stuff. They pursue power. They make enemies. They are often adversarial with many evil groups, just because they've turned bad does not mean the orcs/dragons/demons like them.

The only things that are significantly different is they generally won't do altruistic things, so a kidnapped princess is not of interest, unless there is a reward for them.

 

[iwatt]

...where do you go next?

....Disneyland?