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I was reading some lore from the Forgotten Realms and saw something about higher level spell slots (10, 11 and 12) and them being sealed off for mortal beings.
So I was wondering if PCs know about spell levels as we know them, being able to sort them into tables based on spell level, knowing a fireball is a level 3 spell and magic missile a level 1.
I'm asking this because I want to make a character that is obsessed with 9+ level spells. But this would kinda fall flat without them being able to know the difference between a level 9 and level 10 spell.