Im ready to kill the warmage....

[Shallown]

I think I gotta go with MerelyC's advice. On this one.

An important thing to remember is you aren't direct;y responsible for the players behavour but you are responsible for your own. Your reaction tells more about you than about the player. I think What MerelyC said is the fair and "Grown up" way of dealing with it.

Wickett also has a point of notusing Game mechnics to solve what is an out of game problem. The character isn't doing anything the player is. If the rest of the players are going along (Which it sounds like the do) you need to let them all know this is not polite, nor respectful or nice to do. Let them know however in nice, polite, and respectful ways otherwise you aren't any better than them. (though there are times not being better is fun but only sometimes )

I know its tough but an even hand and polite response from you lets you know you did the right thing even if everything goes to crap.

Later

 

[Barak]

Well this one requires some acting talent, so you might not be able to use it.

Next time it happens, break into tears. Big sobbing fit. Blubber about how he's totally ruining the game for you, making short drift of all your hard work. Then run out of the room.

Sure, they'll think you went weird on 'em, but it sure will throw them all for a loop!

 

[zypherillius]

heres another non death suggestion

P.S Ive already killed him twice in three sessions, so ummm no suggestions of killing his character.

besides telling him that you can memorize the monster manuals all you want. start applying templates, or just adlibbing the monsters. last weekend i ran 3 wights and an entropic white (out of the planar handbook, the entropic template, running it on the spot) against a party of 5 3rd level character, i just didnt do the wights gaining hit points when they drain levels. your the dm, you have rule 0 at your side.

if he catches onto that, give him a wish or something, he sounds like the kind of person that would wish for something extreme. in one campaign i heard about, the way the pc could leave the room was to eat the steak. he ate it, then two more appeared. he ate the two, then four. ate the four, then eight appeared. needless to say, he smothered to death in a room full of meat. if he wishes for something rediculous, give it to him in such a fashion that he would die or be put somewhere that he cant return, but he cant roll up a new character since the old one isnt dead. the old put in suspended animation with the imprisonment spell and unable to be scryed and untouchable by nothing trick. stuff like that ive seen work wonders.

 

[sniffles]

I'd look at him and ask, "Is that you talking or your character?" when he starts making suggestions to the other players. If he says it's his character, ask him to make a skill check vs. whatever skill is appropriate to the situation - in this case, perhaps Knowledge (the Planes).

You could institute a 'no talking out of character' rule, but that's difficult and constraining. I'd follow other posters' suggestions and discuss it calmly with all your players. Let them know that they need to keep player knowledge separate from character knowledge.

 

[Montague68]

Under normal circumstances talking to the player would probably be best. From the original post though I get the feeling that "Bob" isn't the most mature individual however.

What I would do:

Write up a monster that totally negates every one of their major abilities. If they have a wand of fireballs it's immune to fireballs. If the mage likes to memorize disintegrate it's immune to disintegrate. If their most powerful weapon is +4 it has DR +5/20. Wipe the floor with the party and do a TPK. Then politely inform "Bob" and the rest of the party that this is what happens when the DM decides to metagame. Rewind the flow of time back to the beginning of the day or what have you and tell them it was all a dream from last night, and that further mention of out of character knowledge is forbidden.

If you don't want to be so heavy-handed what you could also do is type up a stat-block for each monster ahead of time so you don't need to use the MM.

 

[BlueBlackRed]

Ok, I've got one that doesn't involve making someone cry - though I prefer that option.

During the combat, pick up his character sheet and give the opponents in every single encounter 100% knowledge of his PC.
Strengths, weaknesses, how many spell slots he has remaining, even his usual tactics are known by everyone and everything.
In other words the monsters are going to metagame too and will continue to do so until 1 week after the PC metagaming stops.

It's probably already mentioned though...