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By the Monster Manual the Dragon can also be given spells. A Chromatic Great Wyrm can know and cast 8 spells of up to 9th level. Which can all be of the same level by the rules
Great Wyrm's have stats in Fizbans.
A Chromatic Great Wyrm is CR 27 and Mythic. I don't think a Level 13 party could beat one unless they got near supernaturally lucky.
The city of Greyhawk. (And other Free Cities now rechecking my book)
Humanoids exclusively means Orcs, Kobolds, Goblins and the like in the book (Elves and Dwarves are Demi Humans)
Then you would be wrong as the various humanoids like Orcs, Goblins and others were stated in the original book as having a fairly notable presence in the city.
No it doesn’t. Why would it need to explain those things when they are the same as the default. They don’t need any more explanation than Dwarves, Lizardfolk or Goblins do.
Also non evil orcs were already a thing in Greyhawk.
They don’t need to explain anything you listed, they just need to...
I don't even think the later is needed. Dwarfs and Elves never got an explanation. Neither did the other various humanoids.
Tieflings really need nothing said. given that several demon and devil summoning nations exist in greyhawk.