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I think something like this is already in the DMG.
Edit yeah Morale
The leader makes a wisdom save for a group, or the next highest charisma if the leader is out of the picture. It can auto fail if the DM feels the creature or group would flee at that point.
I have seen several art pieces that show statues and carvings like that for the Mind Flayers. I agree they would not make it themselves, but that’s what they have thralls for.
The planes and cosmology are one of D&D’s unique things throwing them away would be dumb.
And the DMG is still the place they should be talked about just later in the book.
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)