Modern Character in Faerun fic in which the author self-insert suffers from whatever chronic illnesses and disabilities the author suffers from IRL and Shadowheart inadvertently cures them all the first time she casts Lesser Restoration for something.
It turns out that you weren't that far off all those times you'd joked back on Earth that "God nerfed me by giving me [condition] because he knew I'd be too OP without it."
And all that extra effort you used to have to expend every day just to minimally function? That was like a lifelong intensive weightlifting program for your willpower because you were constantly forcing yourself to do things despite all the pain, fatigue, brain fog, nausea, etc. Once you're freed of the shackles of your chronic illnesses and disabilities, you're able to utilize that power in ways chronically healthy and lifelong abled people could never dream of.
Title idea: "Traded My Spoons For Knives"
Lore caveats: Lesser Restoration canonically cures the conditions diseased, poisoned, paralysis, and blinded. If you're missing body parts and want them back then you'll need to wait for the 7th-level divine magic spell Regenerate, which can't be learned in game because character progression is capped at level 12 but should be achievable fairly quickly in a post-game story because clerics and druids get access to 7th-level spells as soon as they hit level 13. If that causes you to inadvertently regenerate body parts that you didn't want back, the 9th-level spell True Polymorph can permanently (with your consent) change your healthy/whole baseline to something else. You'll need a level 18+ wizard to cast it, which Gale was before the orb since he was an archmage, and it's certainly plausible that removing the orb would allow him to bounce back to his old character level without needing to grind XP to get there.
(Inspired by memories of taking Adderall for the first time. That was a REVELATION, y'all. You mean I wasn't just stupid and lazy this whole time? This is what I can do when my brain actually works right? If my physical disabilities and chronic illnesses could also be cured/treated as instantaneously, I'd be unstoppable.)
(Also, how is it that as soon as I start writing my first attempt at fanfic, I start generating ideas for new fanfics faster than I can even write the ideas down much less ever actually write any of the stories?)