Mecheon
Sacabambaspis
I mean, D&D has always been its own setting, ever since Greyhawk. A lot of D&Disms have made their way into standard fantasy but they're D&D-isms specifically.They often believe D&D is its own setting rather than a TTRPG toolbox.
Let's just take a look at some D&D-isms that are unique to D&D and not
1: Spellcasters need a book. Not wands or staffs, they gotta have a spellbook
2: Spells are in short supply but powerful. Vancian casting. Limited numbers of spells but at high power
3: Enough ruins with ancient ruins that 'adventurer' is a viable path
4: Humans, elves, dwarves and some totally-not-a-hobbit will be around. Orcs will probably be around.
5: Depending on age, elves will also go into that partially magic user path and follow similar rules
6: Colour coded dragons.
7: Clerics as the main healing one. Most non-D&D fantasy will go with some sort of priest or, say, an alternative spellcaster for the healing one. Clerics as the main healer and all of their quirks is a particularly D&D quirk of time.
D&D is not a generic toolbox of completely generic fantasy, and never has been ever since the particular quirks of the wizard and cleric were made at the very least. Its included its very specific tropes into things


