Hussar said:
KM - my problem isn't that the peasant gained levels by killing goblins, my problem is that he gained levels at all. Why? Why is he gaining levels. If he's killed enough goblins to gain 3 levels, he's been in literally dozens of life threatening fights. Why isn't he dead? It's ridiculous. If your farmers are fighting off the goblins time and again, why do they need the PC's?
Mostly, he's not dead because he's lucky. Partially, he's not dead because goblins really aren't that menacing.
Don't get me wrong, a goblin with a short sword can kill your 2 hp commoner in one hit fairly often -- if they hit. And the goblin probably has the edge in the fight, so the farmer has reason to be afraid. But when your family is at risk from some four-foot tall psychopath with a short sword, you heft your rusty choppin' axe and
go to work.
And thus your level 4 commoner got lucky. He rolled initiative high enough. He rolled attack rolls high enough. He knew the terrain. He used the environment. He exploited the goblin's weak will. He
got a posse.
In a world of adventure, anyone might have to fight off a goblin (or, occasionally, worse). There's dangerous creatures around every corner. You sleep with your rusty choppin' axe under your pillow, and your family close. You know that the wolf lurking in the woods just beyond your fence wouldn't hesitate to devour your family.
That's part of why adventurers would be common in such a world. While the town guard might be able to repel goblins and kobolds and wolves, they don't do so easily, and they don't do so perfectly, and there are PLENTY of things more dangerous than that in the world.
In a goblin vs. dirt-farmer fight, a lucky dirt-farmer might come up victorious. If she does that often enough, she gains levels, because having potentially deadly experiences is what improves her skills. She doesn't want them, necessarily, but if she's 4th level, she's certainly seen them.
Again, that's just a way 3e remains internally consistent. It's not for everyone, and even if you wanted it, you wouldn't need it to be NPC classes necessarily. But I am fond of the world it creates.