aramis erak
Legend
It's a poor fit to the contents, and it being more S&S than FR is just a matter of degree... especially since all the magic is the same.Total Aside: I never played Greyhawk. When people talk about it now, what is often said is that it is more "sword and sorcery" compared to FR's high fantasy feel. But this cover absolutely does not give me S&S vibes. This is straight up Arthurian.
Early editions had some rulers being Ftr 5... but the earliest Greyhawk is 99% rules - that's the OE Sup 1.
More fundamentally, Greyhawk was EGG Sr's game world. Most of the big name wizards from that campaign are preserved in the AD&D spell list's spell names. The Realms were a mid AD&D 1e addition.
FR does have more "Big Magics" in the settings, but I've never seen rules for casting/enchanting a Mythall - not all the FR magics are PC available, while Greyhawk seems to have no big magics. But I'm not a scholarly level student of either.
Oh, yeah, Mystara, Greyhawk, and FR all have some spacer tech hidden, but for the Realms, that's most certainly because someone didn't get the menu that FR is supposed to be big non-accessible magics instead of tech. And that many modules weren't labeled as to which setting they were for.