nemmerle said:hong, I don't know how this became a prestige class debate, but here goes nothing. . .
Here is another example, from your guildmage example above. . . the player comes to me and says he is interested in this guildmage PrC - and you say, well the guildmages of such and such don't get those abilities they get these [<---insert some other PrC] - because of the nature of the guild or the setting or whatever, would you still allow the Guildmage PrC?
Well, if I'm thinking that guildmages get _these_ abilities as opposed to _those_ abilities, I would say that I've implicitly accepted that there is a place for _a_ guildmage prestige class in my campaign. So yes, I would allow a guildmage PrC. The question then becomes, is the _player_ still willing to play a guildmage after I've made these changes to the published class so that it fits in with my world. If he is, then there's no problem; if he isn't, then that's something for us to resolve.
In practice though, if I've actually got to the stage of saying that guildmages get these abilities and not those abilities, I've probably already got most of the class statted out in my mind. In which case, I would have alerted my player to the fact that I've got a custom PrC that he might be interested in. This helps to prevent the situation where someone wants to play a PrC that definitely doesn't exist in the campaign.
Finally, I don't think a "guildmage" is such a specific concept that I would have to go to the trouble of tweaking published classes to make them fit my game. Maybe if the guild I had in mind specialised in some narrow aspect of magic, like summoning or boom spells or whatnot. But that isn't quite what I was talking about.
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