AbdulAlhazred
Legend
Right, I think I always assumed that by dint of great amounts of practice an NPC could 'get XP' and over time advance, though it would assume such an NPC was of the special subset of all NPCs/Creatures which could advance AT ALL (or at least had the opportunity to do so perhaps).Sure, but I think the veneer sometimes gets pretty thin!
NPCs have levels, in the sense of having a measure of power. But in classic D&D I don't think we're really supposed to imagine them having "earned" those levels through clever dungeoneering. We just assume that the causal processes that operate in the world bring it about that, over time, some people (but not all people) get better at the stuff they do.
Of course there were a plethora of other possibilities, maybe some NPCs were just innately gifted, favored by the gods, endowed with great abilities by virtue of their social station (IE kings are all high level), etc. It seems that various settings and modules had NPCs embodying all of these possibilities.
And, honestly, 4e doesn't really clarify things or change much. NPCs have a level, and a monster type (dramatic role really). The game itself doesn't really offer any explanation for this beyond the gamist one. We've also added a sort of dramatic explanation via the process of altering the dramatic role of an NPC (IE making higher level versions of lower level elites/solos that are standard or minion monsters). Still, 4e admits of the possibility that monsters advance in a simulationistic way.
We likewise assumed a "1", for the same reasons!
I don't know if Gygax ever used this system or not. I posted about it a while ago in a thread debating about whether or not pre-4e editions of D&D had "roles" related to character classes. I think it is strong evidence that, at least as written, AD&D classes did have expected roles.
Yeah, its hard to say. He may have done it in a more informal way perhaps, but AFAIK this was a system that appeared whole cloth in the 1e DMG without any written antecedent, unlike virtually all other 1e material, which was pretty much entirely culled from either OD&D or Dragon/SR articles. It may just have been part of his attempt to 'codify the play of D&D' which he attested was a major motive in producing the AD&D rules set. Perhaps it was an adaptation of some rating system used in tournament play? A lot of AD&D material came out of the con scene, so that is a possibility. It might even have simply been that Gary felt a need to explain to his circle, perhaps in a sort of retcon, why some characters advanced faster than others in his own campaigns.
One COULD see that feature of 1e as presaging various other attempts to 'reward RP' such as issuing plot coupons or bonuses to checks (the precursor to 5e's Inspiration mechanic). If so it was one of the roads not taken as the game evolved.