My character is a level 1 Changeling Bard. In my character's story, his Bard personality is what I'm using for his Divergent Persona racial feature. So it says under the description for divergent persona that I can select "one tool of your choice" for which "the related proficiency bonus is doubled" which I chose as his instrument he uses for his spells.
Does this mean he gets the double proficiency bonus when he casts spells using that instrument? Or is it more in regards to performance checks and such?
It does finish off saying "the related proficiency bonus is doubled for any ability check you make that uses that proficiency". However I think the proficiency bonus I gain from spells doesn't come from my instrument and is instead just my natural proficiency bonus. But theoretically I am still using the instrument to make that spell ability check, so how does this work?
Either way I'm stumped, if anyone is able to logically state an answer for me, I'd be ever grateful!