Quote Originally Posted by Dr.Samurai View Post

But yes, vibes. Totally vibes. Makes sense that someone trained in Athletics and able to jump well could jump down from something as well. Doesn't make as much sense that a samurai fighter would just be able to cast fireball all of a sudden.
Would it be all of a sudden if it required proficiency in arcana? If I was a high elf with the Firebolt cantrip? What about a third level wizard doing it? What about a fifth level cleric? Or an Eldritch Knight? If I'm a fifth level warlock and my buddy casts Fireball, can I make an arcana check to emulate it and cast it with a spell slot, even though it's not on my list?

I'm not necessarily aiming for an answer from you specifically, to be clear, but given the conversation I'm tossing it out there for others to ruminate and reflect on.