On ENWorld:
1) Someone who started rpging in the early days of the hobby. I'm a purist in that I think it has to be the 70s, but I've seen some who started in the early 80s call themselves grognards. I began gaming in '82 but I don't self-identify as a grognard.
2) A fan of a previous edition of an rpg, usually D&D. You see quite a few references to 3e grognards but there's an awareness that it's a strange usage as 3e only became a previous edition very recently.
3) Someone who hates everything published after 1985. Unless it's an exact copy of something published prior to 1985, such as Hackmaster.
Not used on ENWorld:
4) A wargamer.
5) A member of Napoleon's Old Guard.
#5 is the original meaning.
#4 is a cute derivative of #5, as war gaming's most popular setting is Napoleonics
#1 comes from #4, as early D&D sprung from war gaming
#2 comes from #1, as old schoolers are old schoolers
#3 is just repeating #2 in a pejorative way, IMHO.
Keys to grognarditude, IMHO:
-- Don't like 4e, especially the "non-Gygaxian" stuff like Dragonborn and Tieflings
-- Can identify a halberd-ish thing versus a glaive-ish thing by sight, from real historical artifacts or illustrations, and actually cares about this sort of thing.
-- Usually interested in real world history, real world mythology, and classic fantasy (Tolkien, CS Lewis, Conan, etc.)
-- Usually a fan of Gygax & Greyhawk, or perhaps Forgotten Realms, or the City State of Invincible Overlord and other pre-3e settings
-- Tend to care about fluff (all of the above) more than mechanics, and to want the mechanics to reflect some reality outside the game (not just game balance, "fun", etc.)
Orius said:
<<I remember in a previous discussion here, Gary said his definition of grognard was someone who's been consistently playing RPGs for 10+ years.>>
That works for me too.
As for "grognard" being an insult, that's not how I hear it at all. I'm proud of it/aspire to be more like it.
