Few! For a while there I thought I was crazy ... I still do, but I see that I am not alone
I apologize in advance if this post/rant is too long.
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mmu1 has hit the nail on the head with the observation that all folks with the right "aptitude" are trained for magic. Of course, in the rules, the right "aptitude" means an Int of 10+.
Of course the Thayvians are practical (as well as efficient, cruel and sadistic), so they would never bother to train anyone who could never learn more than cantrips until 4th level. So, Int 12 it is for the "aptitude" bit.
For world building and "fluff" bits you have to use the rules that you have, or the system starts to break down. Not in the course of a single dungeon delve of course, but over the course of a major campaign it seriously becomes a problem. How do you justify the number of skill points that is required to do what societies need to do (build bridges, roads, collect taxes, etc) when the rules do not support it? What do you do when the rules (as given) do not lead to the logical conclusions that the campaign settings claim is the end result?
If you set the PCs free in such a world, without considering this first, the man behind the curtain becomes apparent when you are forced to reign them in. Of course, you could choose to not reign them in, but then they turn the campaign world on its ear when the holes in the system become apparent. This would happen all the time if more DMs understood what would happen to a small, local economy that the PCs just drop the proverbial Dragon's Horde onto. The price of gold goes through the floor, hyper-inflation, a rush of liquid capital that spreads ripples throughout the kingdom, etc. etc.
In the PHB or DMG they never said "Ok, here are the rules for you, and here are the rules for everyone else", did they? A simple House Rule, like "Everyone who has an Int of 10+ has a 10% chance of having the 'aptitude' for Magic, and all PCs are assumed to be in this 10%". That keeps things more managable from a societies' level, but its a House Rule, and we are discussing the Core Rules here.
hong: I have always enjoyed your little quotes (and thanks to your strange sense of humor, I still don't know if you are Austrian or Australian), but I have to disagree with you here. The rules in the published adventures and and campaign settings make it very clear that NPCs follow all the same rules that PCs do. Otherwise, how would a DM be able to play them? The belief that PCs are "special" is fluff text, just like the bit about Harrowdale's drought of Wizardly talent. It is not represented in the rules.
Can anyone find something that shows I am wrong here? The DMG preaches a concept of there being a very limited number of "high level" folks, but how can you justify there being 90% 1st level NPC folks in a world of Orcs and Goblins. Just by the numbers the human race is toast. Why haven't they been over-run by Beholders and Mind-Flayer, etc ad nauseum?
I think that this is a chance to explain why. The humans have never been overrun because their agriculture allows them to feed anough people that a large number of them reach Epic Levels. Adjust the FR to fit.
Well, the wife is calling me to bed. I love all you guys, but this is more important. Cheers.
Irda Ranger